diff --git a/Sources/XCTest/Private/PrintObserver.swift b/Sources/XCTest/Private/PrintObserver.swift
index f9b54a8..57ba1aa 100644
--- a/Sources/XCTest/Private/PrintObserver.swift
+++ b/Sources/XCTest/Private/PrintObserver.swift
@@ -53,7 +53,7 @@
 
     private lazy var dateFormatter: DateFormatter = {
         let formatter = DateFormatter()
-        formatter.dateFormat = "HH:mm:ss.SSS"
+        formatter.dateFormat = "yyyy-MM-dd HH:mm:ss.SSS"
         return formatter
     }()
 
diff --git a/Tests/Functional/Asynchronous/Expectations/main.swift b/Tests/Functional/Asynchronous/Expectations/main.swift
index 70c3c1c..6abf294 100644
--- a/Tests/Functional/Asynchronous/Expectations/main.swift
+++ b/Tests/Functional/Asynchronous/Expectations/main.swift
@@ -8,12 +8,12 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'ExpectationsTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'ExpectationsTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class ExpectationsTestCase: XCTestCase {
-// CHECK: Test Case 'ExpectationsTestCase.test_waitingForAnUnfulfilledExpectation_fails' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ExpectationsTestCase.test_waitingForAnUnfulfilledExpectation_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/Tests/Functional/Asynchronous/Expectations/main.swift:[[@LINE+4]]: error: ExpectationsTestCase.test_waitingForAnUnfulfilledExpectation_fails : Asynchronous wait failed - Exceeded timeout of 0.2 seconds, with unfulfilled expectations: foo
 // CHECK: Test Case 'ExpectationsTestCase.test_waitingForAnUnfulfilledExpectation_fails' failed \(\d+\.\d+ seconds\)
     func test_waitingForAnUnfulfilledExpectation_fails() {
@@ -21,7 +21,7 @@
         waitForExpectations(timeout: 0.2)
     }
 
-// CHECK: Test Case 'ExpectationsTestCase.test_waitingForUnfulfilledExpectations_outputsAllExpectations_andFails' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ExpectationsTestCase.test_waitingForUnfulfilledExpectations_outputsAllExpectations_andFails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/Tests/Functional/Asynchronous/Expectations/main.swift:[[@LINE+5]]: error: ExpectationsTestCase.test_waitingForUnfulfilledExpectations_outputsAllExpectations_andFails : Asynchronous wait failed - Exceeded timeout of 0.2 seconds, with unfulfilled expectations: bar, baz
 // CHECK: Test Case 'ExpectationsTestCase.test_waitingForUnfulfilledExpectations_outputsAllExpectations_andFails' failed \(\d+\.\d+ seconds\)
     func test_waitingForUnfulfilledExpectations_outputsAllExpectations_andFails() {
@@ -30,7 +30,7 @@
         waitForExpectations(timeout: 0.2)
     }
 
-// CHECK: Test Case 'ExpectationsTestCase.test_waitingForAnImmediatelyFulfilledExpectation_passes' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ExpectationsTestCase.test_waitingForAnImmediatelyFulfilledExpectation_passes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'ExpectationsTestCase.test_waitingForAnImmediatelyFulfilledExpectation_passes' passed \(\d+\.\d+ seconds\)
     func test_waitingForAnImmediatelyFulfilledExpectation_passes() {
         let expectation = self.expectation(description: "flim")
@@ -38,7 +38,7 @@
         waitForExpectations(timeout: 0.2)
     }
 
-// CHECK: Test Case 'ExpectationsTestCase.test_waitingForAnEventuallyFulfilledExpectation_passes' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ExpectationsTestCase.test_waitingForAnEventuallyFulfilledExpectation_passes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'ExpectationsTestCase.test_waitingForAnEventuallyFulfilledExpectation_passes' passed \(\d+\.\d+ seconds\)
     func test_waitingForAnEventuallyFulfilledExpectation_passes() {
         let expectation = self.expectation(description: "flam")
@@ -49,7 +49,7 @@
         waitForExpectations(timeout: 1.0)
     }
 
-// CHECK: Test Case 'ExpectationsTestCase.test_waitingForAnExpectationFulfilledAfterTheTimeout_fails' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ExpectationsTestCase.test_waitingForAnExpectationFulfilledAfterTheTimeout_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/Tests/Functional/Asynchronous/Expectations/main.swift:[[@LINE+8]]: error: ExpectationsTestCase.test_waitingForAnExpectationFulfilledAfterTheTimeout_fails : Asynchronous wait failed - Exceeded timeout of 0.1 seconds, with unfulfilled expectations: hog
 // CHECK: Test Case 'ExpectationsTestCase.test_waitingForAnExpectationFulfilledAfterTheTimeout_fails' failed \(\d+\.\d+ seconds\)
     func test_waitingForAnExpectationFulfilledAfterTheTimeout_fails() {
@@ -61,7 +61,7 @@
         waitForExpectations(timeout: 0.1)
     }
 
-// CHECK: Test Case 'ExpectationsTestCase.test_whenTimeoutIsImmediate_andAllExpectationsAreFulfilled_passes' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ExpectationsTestCase.test_whenTimeoutIsImmediate_andAllExpectationsAreFulfilled_passes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'ExpectationsTestCase.test_whenTimeoutIsImmediate_andAllExpectationsAreFulfilled_passes' passed \(\d+\.\d+ seconds\)
     func test_whenTimeoutIsImmediate_andAllExpectationsAreFulfilled_passes() {
         let expectation = self.expectation(description: "smog")
@@ -69,7 +69,7 @@
         waitForExpectations(timeout: 0.0)
     }
 
-// CHECK: Test Case 'ExpectationsTestCase.test_whenTimeoutIsImmediate_butNotAllExpectationsAreFulfilled_fails' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ExpectationsTestCase.test_whenTimeoutIsImmediate_butNotAllExpectationsAreFulfilled_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/Tests/Functional/Asynchronous/Expectations/main.swift:[[@LINE+4]]: error: ExpectationsTestCase.test_whenTimeoutIsImmediate_butNotAllExpectationsAreFulfilled_fails : Asynchronous wait failed - Exceeded timeout of -1.0 seconds, with unfulfilled expectations: dog
 // CHECK: Test Case 'ExpectationsTestCase.test_whenTimeoutIsImmediate_butNotAllExpectationsAreFulfilled_fails' failed \(\d+\.\d+ seconds\)
     func test_whenTimeoutIsImmediate_butNotAllExpectationsAreFulfilled_fails() {
@@ -89,12 +89,12 @@
         ]
     }()
 }
-// CHECK: Test Suite 'ExpectationsTestCase' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'ExpectationsTestCase' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 7 tests, with 4 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 XCTMain([testCase(ExpectationsTestCase.allTests)])
 
-// CHECK: Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 7 tests, with 4 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 7 tests, with 4 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/Asynchronous/Handler/main.swift b/Tests/Functional/Asynchronous/Handler/main.swift
index ca1d839..049298c 100644
--- a/Tests/Functional/Asynchronous/Handler/main.swift
+++ b/Tests/Functional/Asynchronous/Handler/main.swift
@@ -8,12 +8,12 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'HandlerTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'HandlerTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class HandlerTestCase: XCTestCase {
-// CHECK: Test Case 'HandlerTestCase.test_whenExpectationsAreNotFulfilled_handlerCalled_andFails' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'HandlerTestCase.test_whenExpectationsAreNotFulfilled_handlerCalled_andFails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/Tests/Functional/Asynchronous/Handler/main.swift:[[@LINE+6]]: error: HandlerTestCase.test_whenExpectationsAreNotFulfilled_handlerCalled_andFails : Asynchronous wait failed - Exceeded timeout of 0.2 seconds, with unfulfilled expectations: fog
 // CHECK: Test Case 'HandlerTestCase.test_whenExpectationsAreNotFulfilled_handlerCalled_andFails' failed \(\d+\.\d+ seconds\)
     func test_whenExpectationsAreNotFulfilled_handlerCalled_andFails() {
@@ -29,7 +29,7 @@
         XCTAssertTrue(handlerWasCalled)
     }
 
-// CHECK: Test Case 'HandlerTestCase.test_whenExpectationsAreFulfilled_handlerCalled_andPasses' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'HandlerTestCase.test_whenExpectationsAreFulfilled_handlerCalled_andPasses' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'HandlerTestCase.test_whenExpectationsAreFulfilled_handlerCalled_andPasses' passed \(\d+\.\d+ seconds\)
     func test_whenExpectationsAreFulfilled_handlerCalled_andPasses() {
         let expectation = self.expectation(description: "bog")
@@ -50,12 +50,12 @@
         ]
     }()
 }
-// CHECK: Test Suite 'HandlerTestCase' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'HandlerTestCase' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 2 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 XCTMain([testCase(HandlerTestCase.allTests)])
 
-// CHECK: Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 2 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 2 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/Asynchronous/Misuse/main.swift b/Tests/Functional/Asynchronous/Misuse/main.swift
index 86d40c0..23cc3a7 100644
--- a/Tests/Functional/Asynchronous/Misuse/main.swift
+++ b/Tests/Functional/Asynchronous/Misuse/main.swift
@@ -8,12 +8,12 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'MisuseTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'MisuseTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class MisuseTestCase: XCTestCase {
-// CHECK: Test Case 'MisuseTestCase.test_whenExpectationsAreMade_butNotWaitedFor_fails' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'MisuseTestCase.test_whenExpectationsAreMade_butNotWaitedFor_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/Tests/Functional/Asynchronous/Misuse/main.swift:[[@LINE+4]]: error: MisuseTestCase.test_whenExpectationsAreMade_butNotWaitedFor_fails : Failed due to unwaited expectations.
 // CHECK: Test Case 'MisuseTestCase.test_whenExpectationsAreMade_butNotWaitedFor_fails' failed \(\d+\.\d+ seconds\)
     func test_whenExpectationsAreMade_butNotWaitedFor_fails() {
@@ -21,14 +21,14 @@
         self.expectation(description: "the second expectation (the file and line number for this one are included in the failure message")
     }
 
-// CHECK: Test Case 'MisuseTestCase.test_whenNoExpectationsAreMade_butTheyAreWaitedFor_fails' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'MisuseTestCase.test_whenNoExpectationsAreMade_butTheyAreWaitedFor_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/Tests/Functional/Asynchronous/Misuse/main.swift:[[@LINE+3]]: error: MisuseTestCase.test_whenNoExpectationsAreMade_butTheyAreWaitedFor_fails : API violation - call made to wait without any expectations having been set.
 // CHECK: Test Case 'MisuseTestCase.test_whenNoExpectationsAreMade_butTheyAreWaitedFor_fails' failed \(\d+\.\d+ seconds\)
     func test_whenNoExpectationsAreMade_butTheyAreWaitedFor_fails() {
         self.waitForExpectations(timeout: 0.1)
     }
 
-// CHECK: Test Case 'MisuseTestCase.test_whenExpectationIsFulfilledMultipleTimes_fails' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'MisuseTestCase.test_whenExpectationIsFulfilledMultipleTimes_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/Tests/Functional/Asynchronous/Misuse/main.swift:[[@LINE+6]]: error: MisuseTestCase.test_whenExpectationIsFulfilledMultipleTimes_fails : API violation - multiple calls made to XCTestExpectation.fulfill\(\) for rob.
 // CHECK: .*/Tests/Functional/Asynchronous/Misuse/main.swift:[[@LINE+15]]: error: MisuseTestCase.test_whenExpectationIsFulfilledMultipleTimes_fails : API violation - multiple calls made to XCTestExpectation.fulfill\(\) for rob.
 // CHECK: Test Case 'MisuseTestCase.test_whenExpectationIsFulfilledMultipleTimes_fails' failed \(\d+\.\d+ seconds\)
@@ -57,12 +57,12 @@
         ]
     }()
 }
-// CHECK: Test Suite 'MisuseTestCase' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'MisuseTestCase' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 3 tests, with 4 failures \(4 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 XCTMain([testCase(MisuseTestCase.allTests)])
 
-// CHECK: Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 3 tests, with 4 failures \(4 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 3 tests, with 4 failures \(4 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/Asynchronous/Notifications/Expectations/main.swift b/Tests/Functional/Asynchronous/Notifications/Expectations/main.swift
index 8ebd1cc..93251a8 100644
--- a/Tests/Functional/Asynchronous/Notifications/Expectations/main.swift
+++ b/Tests/Functional/Asynchronous/Notifications/Expectations/main.swift
@@ -8,12 +8,12 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'NotificationExpectationsTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'NotificationExpectationsTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class NotificationExpectationsTestCase: XCTestCase {
-// CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithName_passes' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithName_passes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithName_passes' passed \(\d+\.\d+ seconds\)
     func test_observeNotificationWithName_passes() {
         let notificationName = "notificationWithNameTest"
@@ -22,7 +22,7 @@
         waitForExpectations(timeout: 0.0)
     }
     
-// CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithNameAndObject_passes' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithNameAndObject_passes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithNameAndObject_passes' passed \(\d+\.\d+ seconds\)
     func test_observeNotificationWithNameAndObject_passes() {
         let notificationName = "notificationWithNameAndObjectTest"
@@ -32,7 +32,7 @@
         waitForExpectations(timeout: 0.0)
     }
     
-// CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithNameAndObject_butExpectingNoObject_passes' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithNameAndObject_butExpectingNoObject_passes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithNameAndObject_butExpectingNoObject_passes' passed \(\d+\.\d+ seconds\)
     func test_observeNotificationWithNameAndObject_butExpectingNoObject_passes() {
         let notificationName = "notificationWithNameAndObject_expectNoObjectTest"
@@ -42,7 +42,7 @@
         waitForExpectations(timeout: 0.0)
     }
     
-// CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithIncorrectName_fails' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithIncorrectName_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/Tests/Functional/Asynchronous/Notifications/Expectations/main.swift:[[@LINE+5]]: error: NotificationExpectationsTestCase.test_observeNotificationWithIncorrectName_fails : Asynchronous wait failed - Exceeded timeout of 0.1 seconds, with unfulfilled expectations: Expect notification 'expectedName' from any object
 // CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithIncorrectName_fails' failed \(\d+\.\d+ seconds\)
     func test_observeNotificationWithIncorrectName_fails() {
@@ -51,7 +51,7 @@
         waitForExpectations(timeout: 0.1)
     }
     
-// CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithIncorrectObject_fails' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithIncorrectObject_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/Tests/Functional/Asynchronous/Notifications/Expectations/main.swift:[[@LINE+8]]: error: NotificationExpectationsTestCase.test_observeNotificationWithIncorrectObject_fails : Asynchronous wait failed - Exceeded timeout of 0.1 seconds, with unfulfilled expectations: Expect notification 'notificationWithIncorrectObjectTest' from dummyObject
 // CHECK: Test Case 'NotificationExpectationsTestCase.test_observeNotificationWithIncorrectObject_fails' failed \(\d+\.\d+ seconds\)
     func test_observeNotificationWithIncorrectObject_fails() {
@@ -73,12 +73,12 @@
         ]
     }()
 }
-// CHECK: Test Suite 'NotificationExpectationsTestCase' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'NotificationExpectationsTestCase' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 5 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 XCTMain([testCase(NotificationExpectationsTestCase.allTests)])
 
-// CHECK: Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 5 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 5 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/Asynchronous/Notifications/Handler/main.swift b/Tests/Functional/Asynchronous/Notifications/Handler/main.swift
index a9013a0..4060f8b 100644
--- a/Tests/Functional/Asynchronous/Notifications/Handler/main.swift
+++ b/Tests/Functional/Asynchronous/Notifications/Handler/main.swift
@@ -8,12 +8,12 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'NotificationHandlerTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'NotificationHandlerTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class NotificationHandlerTestCase: XCTestCase {
-// CHECK: Test Case 'NotificationHandlerTestCase.test_notificationNameIsObserved_handlerReturnsFalse_andFails' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'NotificationHandlerTestCase.test_notificationNameIsObserved_handlerReturnsFalse_andFails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/Tests/Functional/Asynchronous/Notifications/Handler/main.swift:[[@LINE+8]]: error: NotificationHandlerTestCase.test_notificationNameIsObserved_handlerReturnsFalse_andFails : Asynchronous wait failed - Exceeded timeout of 0.1 seconds, with unfulfilled expectations: Expect notification 'returnFalse' from any object
 // CHECK: Test Case 'NotificationHandlerTestCase.test_notificationNameIsObserved_handlerReturnsFalse_andFails' failed \(\d+\.\d+ seconds\)
     func test_notificationNameIsObserved_handlerReturnsFalse_andFails() {
@@ -25,7 +25,7 @@
         waitForExpectations(timeout: 0.1)
     }
     
-// CHECK: Test Case 'NotificationHandlerTestCase.test_notificationNameIsObserved_handlerReturnsTrue_andPasses' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'NotificationHandlerTestCase.test_notificationNameIsObserved_handlerReturnsTrue_andPasses' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'NotificationHandlerTestCase.test_notificationNameIsObserved_handlerReturnsTrue_andPasses' passed \(\d+\.\d+ seconds\)
     func test_notificationNameIsObserved_handlerReturnsTrue_andPasses() {
         expectation(forNotification: "returnTrue", object: nil, handler: {
@@ -36,7 +36,7 @@
         waitForExpectations(timeout: 0.1)
     }
 
-// CHECK: Test Case 'NotificationHandlerTestCase.test_notificationNameIsObservedAfterTimeout_handlerIsNotCalled' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'NotificationHandlerTestCase.test_notificationNameIsObservedAfterTimeout_handlerIsNotCalled' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/Tests/Functional/Asynchronous/Notifications/Handler/main.swift:[[@LINE+7]]: error: NotificationHandlerTestCase.test_notificationNameIsObservedAfterTimeout_handlerIsNotCalled : Asynchronous wait failed - Exceeded timeout of 0.1 seconds, with unfulfilled expectations: Expect notification 'note' from any object
 // CHECK: Test Case 'NotificationHandlerTestCase.test_notificationNameIsObservedAfterTimeout_handlerIsNotCalled' failed \(\d+\.\d+ seconds\)
     func test_notificationNameIsObservedAfterTimeout_handlerIsNotCalled() {
@@ -56,13 +56,13 @@
         ]
     }()
 }
-// CHECK: Test Suite 'NotificationHandlerTestCase' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'NotificationHandlerTestCase' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 3 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 
 XCTMain([testCase(NotificationHandlerTestCase.allTests)])
 
-// CHECK: Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 3 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 3 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/Asynchronous/Predicates/Expectations/main.swift b/Tests/Functional/Asynchronous/Predicates/Expectations/main.swift
index 23c25d8..346a06b 100644
--- a/Tests/Functional/Asynchronous/Predicates/Expectations/main.swift
+++ b/Tests/Functional/Asynchronous/Predicates/Expectations/main.swift
@@ -8,12 +8,12 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'PredicateExpectationsTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'PredicateExpectationsTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class PredicateExpectationsTestCase: XCTestCase {
-    // CHECK: Test Case 'PredicateExpectationsTestCase.test_immediatelyTruePredicateAndObject_passes' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PredicateExpectationsTestCase.test_immediatelyTruePredicateAndObject_passes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     // CHECK: Test Case 'PredicateExpectationsTestCase.test_immediatelyTruePredicateAndObject_passes' passed \(\d+\.\d+ seconds\)
     func test_immediatelyTruePredicateAndObject_passes() {
         let predicate = NSPredicate(value: true)
@@ -22,7 +22,7 @@
         waitForExpectations(timeout: 0.1)
     }
 
-    // CHECK: Test Case 'PredicateExpectationsTestCase.test_immediatelyFalsePredicateAndObject_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PredicateExpectationsTestCase.test_immediatelyFalsePredicateAndObject_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     // CHECK: .*/Tests/Functional/Asynchronous/Predicates/Expectations/main.swift:[[@LINE+6]]: error: PredicateExpectationsTestCase.test_immediatelyFalsePredicateAndObject_fails : Asynchronous wait failed - Exceeded timeout of 0.1 seconds, with unfulfilled expectations: Expect `<NSPredicate: 0x[0-9A-Fa-f]{1,16}>` for object <NSObject: 0x[0-9A-Fa-f]{1,16}>
     // CHECK: Test Case 'PredicateExpectationsTestCase.test_immediatelyFalsePredicateAndObject_fails' failed \(\d+\.\d+ seconds\)
     func test_immediatelyFalsePredicateAndObject_fails() {
@@ -32,7 +32,7 @@
         waitForExpectations(timeout: 0.1)
     }
 
-    // CHECK: Test Case 'PredicateExpectationsTestCase.test_delayedTruePredicateAndObject_passes' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PredicateExpectationsTestCase.test_delayedTruePredicateAndObject_passes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     // CHECK: Test Case 'PredicateExpectationsTestCase.test_delayedTruePredicateAndObject_passes' passed \(\d+\.\d+ seconds\)
     func test_delayedTruePredicateAndObject_passes() {
         var didEvaluate = false
@@ -44,7 +44,7 @@
         waitForExpectations(timeout: 0.1)
     }
     
-    // CHECK: Test Case 'PredicateExpectationsTestCase.test_immediatelyTrueDelayedFalsePredicateAndObject_passes' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PredicateExpectationsTestCase.test_immediatelyTrueDelayedFalsePredicateAndObject_passes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     // CHECK: Test Case 'PredicateExpectationsTestCase.test_immediatelyTrueDelayedFalsePredicateAndObject_passes' passed \(\d+\.\d+ seconds\)
     func test_immediatelyTrueDelayedFalsePredicateAndObject_passes() {
         var didEvaluate = false
@@ -68,11 +68,11 @@
     }()
 }
 
-// CHECK: Test Suite 'PredicateExpectationsTestCase' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'PredicateExpectationsTestCase' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 4 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 XCTMain([testCase(PredicateExpectationsTestCase.allTests)])
 
-// CHECK: Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 4 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 4 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/Asynchronous/Predicates/Handler/main.swift b/Tests/Functional/Asynchronous/Predicates/Handler/main.swift
index bc29eae..b977ce5 100644
--- a/Tests/Functional/Asynchronous/Predicates/Handler/main.swift
+++ b/Tests/Functional/Asynchronous/Predicates/Handler/main.swift
@@ -8,12 +8,12 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'PredicateHandlerTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'PredicateHandlerTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class PredicateHandlerTestCase: XCTestCase {
-    // CHECK: Test Case 'PredicateHandlerTestCase.test_predicateIsTrue_handlerReturnsTrue_passes' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PredicateHandlerTestCase.test_predicateIsTrue_handlerReturnsTrue_passes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     // CHECK: Test Case 'PredicateHandlerTestCase.test_predicateIsTrue_handlerReturnsTrue_passes' passed \(\d+\.\d+ seconds\)
     func test_predicateIsTrue_handlerReturnsTrue_passes() {
         let predicate = NSPredicate(value: true)
@@ -23,7 +23,7 @@
         })
         waitForExpectations(timeout: 0.1)
     }
-    // CHECK: Test Case 'PredicateHandlerTestCase.test_predicateIsTrue_handlerReturnsFalse_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PredicateHandlerTestCase.test_predicateIsTrue_handlerReturnsFalse_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     // CHECK: .*/Tests/Functional/Asynchronous/Predicates/Handler/main.swift:[[@LINE+8]]: error: PredicateHandlerTestCase.test_predicateIsTrue_handlerReturnsFalse_fails : Asynchronous wait failed - Exceeded timeout of 0.1 seconds, with unfulfilled expectations: Expect `<NSPredicate: 0x[0-9a-fA-F]{1,16}>` for object <NSObject: 0x[0-9a-fA-F]{1,16}>
     // CHECK: Test Case 'PredicateHandlerTestCase.test_predicateIsTrue_handlerReturnsFalse_fails' failed \(\d+\.\d+ seconds\)
     func test_predicateIsTrue_handlerReturnsFalse_fails() {
@@ -35,7 +35,7 @@
         waitForExpectations(timeout: 0.1)
     }
     
-    // CHECK: Test Case 'PredicateHandlerTestCase.test_predicateIsTrueAfterTimeout_handlerIsNotCalled_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PredicateHandlerTestCase.test_predicateIsTrueAfterTimeout_handlerIsNotCalled_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     // CHECK: .*/Tests/Functional/Asynchronous/Predicates/Handler/main.swift:[[@LINE+14]]: error: PredicateHandlerTestCase.test_predicateIsTrueAfterTimeout_handlerIsNotCalled_fails : Asynchronous wait failed - Exceeded timeout of 0.1 seconds, with unfulfilled expectations: Expect `<NSPredicate: 0x[0-9a-fA-F]{1,16}>` for object \d{4}-\d{2}-\d{2} \d+:\d+:\d+ \+\d+
     // CHECK: Test Case 'PredicateHandlerTestCase.test_predicateIsTrueAfterTimeout_handlerIsNotCalled_fails' failed \(\d+\.\d+ seconds\)
     func test_predicateIsTrueAfterTimeout_handlerIsNotCalled_fails() {
@@ -62,11 +62,11 @@
     }()
 }
 
-// CHECK: Test Suite 'PredicateHandlerTestCase' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'PredicateHandlerTestCase' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 3 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 XCTMain([testCase(PredicateHandlerTestCase.allTests)])
 
-// CHECK: Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 3 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 3 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/ErrorHandling/main.swift b/Tests/Functional/ErrorHandling/main.swift
index 45a9049..9e01662 100644
--- a/Tests/Functional/ErrorHandling/main.swift
+++ b/Tests/Functional/ErrorHandling/main.swift
@@ -8,10 +8,10 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'ErrorHandling' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'ErrorHandling' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class ErrorHandling: XCTestCase {
     static var allTests = {
         return [
@@ -44,14 +44,14 @@
         throw SomeError.anError("an error message")
     }
 
-// CHECK: Test Case 'ErrorHandling.test_shouldButDoesNotThrowErrorInAssertion' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ErrorHandling.test_shouldButDoesNotThrowErrorInAssertion' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/ErrorHandling/main.swift:[[@LINE+3]]: error: ErrorHandling.test_shouldButDoesNotThrowErrorInAssertion : XCTAssertThrowsError failed: did not throw error -
 // CHECK: Test Case 'ErrorHandling.test_shouldButDoesNotThrowErrorInAssertion' failed \(\d+\.\d+ seconds\)
     func test_shouldButDoesNotThrowErrorInAssertion() {
         XCTAssertThrowsError(try functionThatDoesNotThrowError())
     }
     
-// CHECK: Test Case 'ErrorHandling.test_shouldThrowErrorInAssertion' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ErrorHandling.test_shouldThrowErrorInAssertion' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'ErrorHandling.test_shouldThrowErrorInAssertion' passed \(\d+\.\d+ seconds\)
     func test_shouldThrowErrorInAssertion() {
         XCTAssertThrowsError(try functionThatDoesThrowError()) { error in
@@ -67,7 +67,7 @@
         }
     }
     
-// CHECK: Test Case 'ErrorHandling.test_throwsErrorInAssertionButFailsWhenCheckingError' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ErrorHandling.test_throwsErrorInAssertionButFailsWhenCheckingError' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/ErrorHandling/main.swift:[[@LINE+11]]: error: ErrorHandling.test_throwsErrorInAssertionButFailsWhenCheckingError : XCTAssertEqual failed: \("an error message"\) is not equal to \(""\) -
 // CHECK: Test Case 'ErrorHandling.test_throwsErrorInAssertionButFailsWhenCheckingError' failed \(\d+\.\d+ seconds\)
     func test_throwsErrorInAssertionButFailsWhenCheckingError() {
@@ -84,14 +84,14 @@
         }
     }
 
-// CHECK: Test Case 'ErrorHandling.test_canAndDoesThrowErrorFromTestMethod' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ErrorHandling.test_canAndDoesThrowErrorFromTestMethod' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \<EXPR\>:0: error: ErrorHandling.test_canAndDoesThrowErrorFromTestMethod : threw error "anError\("an error message"\)"
 // CHECK: Test Case 'ErrorHandling.test_canAndDoesThrowErrorFromTestMethod' failed \(\d+\.\d+ seconds\)
     func test_canAndDoesThrowErrorFromTestMethod() throws {
         try functionThatDoesThrowError()
     }
     
-// CHECK: Test Case 'ErrorHandling.test_canButDoesNotThrowErrorFromTestMethod' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ErrorHandling.test_canButDoesNotThrowErrorFromTestMethod' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'ErrorHandling.test_canButDoesNotThrowErrorFromTestMethod' passed \(\d+\.\d+ seconds\)
     func test_canButDoesNotThrowErrorFromTestMethod() throws {
         try functionThatDoesNotThrowError()
@@ -101,7 +101,7 @@
         throw SomeError.anError("did not actually return")
     }
 
-// CHECK: Test Case 'ErrorHandling.test_assertionExpressionCanThrow' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ErrorHandling.test_assertionExpressionCanThrow' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/ErrorHandling/main.swift:[[@LINE+3]]: error: ErrorHandling.test_assertionExpressionCanThrow : XCTAssertEqual threw error "anError\("did not actually return"\)" -
 // CHECK: Test Case 'ErrorHandling.test_assertionExpressionCanThrow' failed \(\d+\.\d+ seconds\)
     func test_assertionExpressionCanThrow() {
@@ -109,13 +109,13 @@
     }
 
 
-// CHECK: Test Case 'ErrorHandling.test_shouldNotThrowErrorDefiningSuccess' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ErrorHandling.test_shouldNotThrowErrorDefiningSuccess' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'ErrorHandling.test_shouldNotThrowErrorDefiningSuccess' passed \(\d+\.\d+ seconds\)
     func test_shouldNotThrowErrorDefiningSuccess() {
         XCTAssertNoThrow(try functionThatDoesNotThrowError())
     }
 
-// CHECK: Test Case 'ErrorHandling.test_shouldThrowErrorDefiningFailure' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ErrorHandling.test_shouldThrowErrorDefiningFailure' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/ErrorHandling/main.swift:[[@LINE+3]]: error: ErrorHandling.test_shouldThrowErrorDefiningFailure : XCTAssertNoThrow failed: threw error "anError\("an error message"\)" -
 // CHECK: Test Case 'ErrorHandling.test_shouldThrowErrorDefiningFailure' failed \(\d+\.\d+ seconds\)
     func test_shouldThrowErrorDefiningFailure() {
@@ -123,12 +123,12 @@
     }
 }
 
-// CHECK: Test Suite 'ErrorHandling' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'ErrorHandling' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed \d+ tests, with \d+ failures \(2 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 XCTMain([testCase(ErrorHandling.allTests)])
 
-// CHECK: Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed \d+ tests, with \d+ failures \(2 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed \d+ tests, with \d+ failures \(2 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/FailingTestSuite/main.swift b/Tests/Functional/FailingTestSuite/main.swift
index 41d8a59..56cebe7 100644
--- a/Tests/Functional/FailingTestSuite/main.swift
+++ b/Tests/Functional/FailingTestSuite/main.swift
@@ -8,10 +8,10 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'PassingTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'PassingTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class PassingTestCase: XCTestCase {
     static var allTests = {
         return [
@@ -19,16 +19,16 @@
         ]
     }()
 
-// CHECK: Test Case 'PassingTestCase.test_passes' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'PassingTestCase.test_passes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'PassingTestCase.test_passes' passed \(\d+\.\d+ seconds\)
     func test_passes() {
         XCTAssert(true)
     }
 }
-// CHECK: Test Suite 'PassingTestCase' passed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'PassingTestCase' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
-// CHECK: Test Suite 'FailingTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'FailingTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class FailingTestCase: XCTestCase {
     static var allTests = {
         return [
@@ -38,27 +38,27 @@
         ]
     }()
 
-// CHECK: Test Case 'FailingTestCase.test_passes' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailingTestCase.test_passes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'FailingTestCase.test_passes' passed \(\d+\.\d+ seconds\)
     func test_passes() {
         XCTAssert(true)
     }
 
-// CHECK: Test Case 'FailingTestCase.test_fails' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailingTestCase.test_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/FailingTestSuite/main.swift:[[@LINE+3]]: error: FailingTestCase.test_fails : XCTAssertTrue failed - $
 // CHECK: Test Case 'FailingTestCase.test_fails' failed \(\d+\.\d+ seconds\)
     func test_fails() {
         XCTAssert(false)
     }
 
-// CHECK: Test Case 'FailingTestCase.test_fails_with_message' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailingTestCase.test_fails_with_message' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/FailingTestSuite/main.swift:[[@LINE+3]]: error: FailingTestCase.test_fails_with_message : XCTAssertTrue failed - Foo bar.
 // CHECK: Test Case 'FailingTestCase.test_fails_with_message' failed \(\d+\.\d+ seconds\)
     func test_fails_with_message() {
         XCTAssert(false, "Foo bar.")
     }
 }
-// CHECK: Test Suite 'FailingTestCase' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'FailingTestCase' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 3 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 XCTMain([
@@ -66,7 +66,7 @@
     testCase(FailingTestCase.allTests),
 ])
 
-// CHECK: Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 4 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 4 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/FailureMessagesTestCase/main.swift b/Tests/Functional/FailureMessagesTestCase/main.swift
index b14f473..51fc2e0 100644
--- a/Tests/Functional/FailureMessagesTestCase/main.swift
+++ b/Tests/Functional/FailureMessagesTestCase/main.swift
@@ -10,10 +10,10 @@
 
 // Regression test for https://github.com/apple/swift-corelibs-xctest/pull/22
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'FailureMessagesTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'FailureMessagesTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class FailureMessagesTestCase: XCTestCase {
     static var allTests = {
         return [
@@ -44,180 +44,180 @@
         ]
     }()
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssert' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssert' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssert : XCTAssertTrue failed - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssert' failed \(\d+\.\d+ seconds\)
     func testAssert() throws {
         XCTAssert(false, "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualValues' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualValues' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertEqualValues : XCTAssertEqual failed: \("1"\) is not equal to \("2"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualValues' failed \(\d+\.\d+ seconds\)
     func testAssertEqualValues() {
         XCTAssertEqual(1, 2, "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualOptionals' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualOptionals' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertEqualOptionals : XCTAssertEqual failed: \("Optional\(1\)"\) is not equal to \("Optional\(2\)"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualOptionals' failed \(\d+\.\d+ seconds\)
     func testAssertEqualOptionals() {
         XCTAssertEqual(Optional(1), Optional(2), "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualArraySlices' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualArraySlices' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertEqualArraySlices : XCTAssertEqual failed: \("\[1\]"\) is not equal to \("\[2\]"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualArraySlices' failed \(\d+\.\d+ seconds\)
     func testAssertEqualArraySlices() {
         XCTAssertEqual([1][0..<1], [2][0..<1], "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualContiguousArrays' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualContiguousArrays' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertEqualContiguousArrays : XCTAssertEqual failed: \("\[1\]"\) is not equal to \("\[2\]"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualContiguousArrays' failed \(\d+\.\d+ seconds\)
     func testAssertEqualContiguousArrays() {
         XCTAssertEqual(ContiguousArray(arrayLiteral: 1), ContiguousArray(arrayLiteral: 2), "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualArrays' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualArrays' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertEqualArrays : XCTAssertEqual failed: \("\[1\]"\) is not equal to \("\[2\]"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualArrays' failed \(\d+\.\d+ seconds\)
     func testAssertEqualArrays() {
         XCTAssertEqual([1], [2], "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualDictionaries' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualDictionaries' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertEqualDictionaries : XCTAssertEqual failed: \("\[1: 2\]"\) is not equal to \("\[3: 4\]"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualDictionaries' failed \(\d+\.\d+ seconds\)
     func testAssertEqualDictionaries() {
         XCTAssertEqual([1:2], [3:4], "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualWithAccuracy' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualWithAccuracy' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertEqualWithAccuracy : XCTAssertEqualWithAccuracy failed: \("1\.0"\) is not equal to \("2\.0"\) \+/- \("0\.1"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertEqualWithAccuracy' failed \(\d+\.\d+ seconds\)
     func testAssertEqualWithAccuracy() {
         XCTAssertEqualWithAccuracy(1, 2, accuracy: 0.1, "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertFalse' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertFalse' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertFalse : XCTAssertFalse failed - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertFalse' failed \(\d+\.\d+ seconds\)
     func testAssertFalse() {
         XCTAssertFalse(true, "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertGreaterThan' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertGreaterThan' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertGreaterThan : XCTAssertGreaterThan failed: \("0"\) is not greater than \("0"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertGreaterThan' failed \(\d+\.\d+ seconds\)
     func testAssertGreaterThan() {
         XCTAssertGreaterThan(0, 0, "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertGreaterThanOrEqual' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertGreaterThanOrEqual' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertGreaterThanOrEqual : XCTAssertGreaterThanOrEqual failed: \("-1"\) is less than \("0"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertGreaterThanOrEqual' failed \(\d+\.\d+ seconds\)
     func testAssertGreaterThanOrEqual() {
         XCTAssertGreaterThanOrEqual(-1, 0, "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertLessThan' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertLessThan' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertLessThan : XCTAssertLessThan failed: \("0"\) is not less than \("0"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertLessThan' failed \(\d+\.\d+ seconds\)
     func testAssertLessThan() {
         XCTAssertLessThan(0, 0, "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertLessThanOrEqual' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertLessThanOrEqual' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertLessThanOrEqual : XCTAssertLessThanOrEqual failed: \("1"\) is greater than \("0"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertLessThanOrEqual' failed \(\d+\.\d+ seconds\)
     func testAssertLessThanOrEqual() {
         XCTAssertLessThanOrEqual(1, 0, "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertNil' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertNil' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertNil : XCTAssertNil failed: "helloworld" - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertNil' failed \(\d+\.\d+ seconds\)
     func testAssertNil() {
         XCTAssertNil("helloworld", "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualValues' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualValues' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertNotEqualValues : XCTAssertNotEqual failed: \("1"\) is equal to \("1"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualValues' failed \(\d+\.\d+ seconds\)
     func testAssertNotEqualValues() {
         XCTAssertNotEqual(1, 1, "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualOptionals' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualOptionals' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertNotEqualOptionals : XCTAssertNotEqual failed: \("Optional\(1\)"\) is equal to \("Optional\(1\)"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualOptionals' failed \(\d+\.\d+ seconds\)
     func testAssertNotEqualOptionals() {
         XCTAssertNotEqual(Optional(1), Optional(1), "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualArraySlices' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualArraySlices' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertNotEqualArraySlices : XCTAssertNotEqual failed: \("\[1\]"\) is equal to \("\[1\]"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualArraySlices' failed \(\d+\.\d+ seconds\)
     func testAssertNotEqualArraySlices() {
         XCTAssertNotEqual([1][0..<1], [1][0..<1], "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualContiguousArrays' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualContiguousArrays' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertNotEqualContiguousArrays : XCTAssertNotEqual failed: \("\[1\]"\) is equal to \("\[1\]"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualContiguousArrays' failed \(\d+\.\d+ seconds\)
     func testAssertNotEqualContiguousArrays() {
         XCTAssertNotEqual(ContiguousArray(arrayLiteral: 1), ContiguousArray(arrayLiteral: 1), "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualArrays' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualArrays' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertNotEqualArrays : XCTAssertNotEqual failed: \("\[1\]"\) is equal to \("\[1\]"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualArrays' failed \(\d+\.\d+ seconds\)
     func testAssertNotEqualArrays() {
         XCTAssertNotEqual([1], [1], "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualDictionaries' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualDictionaries' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertNotEqualDictionaries : XCTAssertNotEqual failed: \("\[1: 1\]"\) is equal to \("\[1: 1\]"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualDictionaries' failed \(\d+\.\d+ seconds\)
     func testAssertNotEqualDictionaries() {
         XCTAssertNotEqual([1:1], [1:1], "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualWithAccuracy' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualWithAccuracy' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertNotEqualWithAccuracy : XCTAssertNotEqualWithAccuracy failed: \("1\.0"\) is equal to \("1\.0"\) \+/- \("0\.1"\) - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertNotEqualWithAccuracy' failed \(\d+\.\d+ seconds\)
     func testAssertNotEqualWithAccuracy() {
         XCTAssertNotEqualWithAccuracy(1, 1, 0.1, "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotNil' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertNotNil' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertNotNil : XCTAssertNotNil failed - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertNotNil' failed \(\d+\.\d+ seconds\)
     func testAssertNotNil() {
         XCTAssertNotNil(nil, "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testAssertTrue' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testAssertTrue' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testAssertTrue : XCTAssertTrue failed - message
 // CHECK: Test Case 'FailureMessagesTestCase.testAssertTrue' failed \(\d+\.\d+ seconds\)
     func testAssertTrue() {
         XCTAssertTrue(false, "message", file: "test.swift")
     }
 
-// CHECK: Test Case 'FailureMessagesTestCase.testFail' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'FailureMessagesTestCase.testFail' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: test.swift:[[@LINE+3]]: error: FailureMessagesTestCase.testFail : failed - message
 // CHECK: Test Case 'FailureMessagesTestCase.testFail' failed \(\d+\.\d+ seconds\)
     func testFail() {
         XCTFail("message", file: "test.swift")
     }
 }
-// CHECK: Test Suite 'FailureMessagesTestCase' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'FailureMessagesTestCase' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 24 tests, with 24 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 XCTMain([testCase(FailureMessagesTestCase.allTests)])
 
-// CHECK: Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 24 tests, with 24 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 24 tests, with 24 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/NegativeAccuracyTestCase/main.swift b/Tests/Functional/NegativeAccuracyTestCase/main.swift
index 4256fe7..59b0c8c 100644
--- a/Tests/Functional/NegativeAccuracyTestCase/main.swift
+++ b/Tests/Functional/NegativeAccuracyTestCase/main.swift
@@ -10,10 +10,10 @@
 
 // Regression test for https://github.com/apple/swift-corelibs-xctest/pull/7
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'NegativeAccuracyTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'NegativeAccuracyTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class NegativeAccuracyTestCase: XCTestCase {
     static var allTests = {
         return [
@@ -24,38 +24,38 @@
         ]
     }()
 
-// CHECK: Test Case 'NegativeAccuracyTestCase.test_equalWithAccuracy_passes' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'NegativeAccuracyTestCase.test_equalWithAccuracy_passes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'NegativeAccuracyTestCase.test_equalWithAccuracy_passes' passed \(\d+\.\d+ seconds\)
     func test_equalWithAccuracy_passes() {
         XCTAssertEqualWithAccuracy(0, 0.1, accuracy: -0.1)
     }
 
-// CHECK: Test Case 'NegativeAccuracyTestCase.test_equalWithAccuracy_fails' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'NegativeAccuracyTestCase.test_equalWithAccuracy_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/NegativeAccuracyTestCase/main.swift:[[@LINE+3]]: error: NegativeAccuracyTestCase.test_equalWithAccuracy_fails : XCTAssertEqualWithAccuracy failed: \(\"0\.0\"\) is not equal to \(\"0\.2\"\) \+\/- \(\"-0\.1\"\) - $
 // CHECK: Test Case 'NegativeAccuracyTestCase.test_equalWithAccuracy_fails' failed \(\d+\.\d+ seconds\)
     func test_equalWithAccuracy_fails() {
         XCTAssertEqualWithAccuracy(0, 0.2, accuracy: -0.1)
     }
 
-// CHECK: Test Case 'NegativeAccuracyTestCase.test_notEqualWithAccuracy_passes' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'NegativeAccuracyTestCase.test_notEqualWithAccuracy_passes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'NegativeAccuracyTestCase.test_notEqualWithAccuracy_passes' passed \(\d+\.\d+ seconds\)
     func test_notEqualWithAccuracy_passes() {
         XCTAssertNotEqualWithAccuracy(1, 2, -0.5)
     }
 
-// CHECK: Test Case 'NegativeAccuracyTestCase.test_notEqualWithAccuracy_fails' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'NegativeAccuracyTestCase.test_notEqualWithAccuracy_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/NegativeAccuracyTestCase/main.swift:[[@LINE+3]]: error: NegativeAccuracyTestCase.test_notEqualWithAccuracy_fails : XCTAssertNotEqualWithAccuracy failed: \("1\.0"\) is equal to \("2\.0"\) \+/- \("-1\.0"\) - $
 // CHECK: Test Case 'NegativeAccuracyTestCase.test_notEqualWithAccuracy_fails' failed \(\d+\.\d+ seconds\)
     func test_notEqualWithAccuracy_fails() {
         XCTAssertNotEqualWithAccuracy(1, 2, -1)
     }
 }
-// CHECK: Test Suite 'NegativeAccuracyTestCase' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'NegativeAccuracyTestCase' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 4 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 XCTMain([testCase(NegativeAccuracyTestCase.allTests)])
 
-// CHECK: Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 4 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 4 tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/Observation/All/main.swift b/Tests/Functional/Observation/All/main.swift
index 9f1d30e..b25767d 100644
--- a/Tests/Functional/Observation/All/main.swift
+++ b/Tests/Functional/Observation/All/main.swift
@@ -8,8 +8,8 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
 class Observer: XCTestObservation {
     var startedBundlePaths = [String]()
@@ -52,7 +52,7 @@
 let observer = Observer()
 XCTestObservationCenter.shared().addTestObserver(observer)
 
-// CHECK: Test Suite 'Observation' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'Observation' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class Observation: XCTestCase {
     static var allTests = {
         return [
@@ -62,7 +62,7 @@
         ]
     }()
 
-// CHECK: Test Case 'Observation.test_one' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'Observation.test_one' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: .*/Observation/All/main.swift:[[@LINE+12]]: error: Observation.test_one : failed - fail!
 // CHECK: Test Case 'Observation.test_one' failed \(\d+\.\d+ seconds\)
     func test_one() {
@@ -79,7 +79,7 @@
         XCTAssertEqual(observer.failureDescriptions, ["failed - fail!"])
     }
 
-// CHECK: Test Case 'Observation.test_two' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'Observation.test_two' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'Observation.test_two' passed \(\d+\.\d+ seconds\)
     func test_two() {
         XCTAssertEqual(observer.startedBundlePaths.count, 1)
@@ -93,7 +93,7 @@
         XCTestObservationCenter.shared().removeTestObserver(observer)
     }
 
-// CHECK: Test Case 'Observation.test_three' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'Observation.test_three' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'Observation.test_three' passed \(\d+\.\d+ seconds\)
     func test_three() {
         XCTAssertEqual(observer.startedBundlePaths.count, 1)
@@ -108,18 +108,18 @@
 // There's no guarantee as to the order in which these two observers will be
 // called, so we match any order here.
 
-// CHECK: (In testSuiteDidFinish: Observation)|(Test Suite 'Observation' failed at \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
-// CHECK: (In testSuiteDidFinish: Observation)|(Test Suite 'Observation' failed at \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
-// CHECK: (In testSuiteDidFinish: Observation)|(Test Suite 'Observation' failed at \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: Observation)|(Test Suite 'Observation' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: Observation)|(Test Suite 'Observation' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: Observation)|(Test Suite 'Observation' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
 
 XCTMain([testCase(Observation.allTests)])
 
-// CHECK: (In testSuiteDidFinish: .*\.xctest)|(Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
-// CHECK: (In testSuiteDidFinish: .*\.xctest)|(Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
-// CHECK: (In testSuiteDidFinish: .*\.xctest)|(Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: .*\.xctest)|(Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: .*\.xctest)|(Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: .*\.xctest)|(Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
 
-// CHECK: (In testSuiteDidFinish: All tests)|(Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
-// CHECK: (In testSuiteDidFinish: All tests)|(Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
-// CHECK: (In testSuiteDidFinish: All tests)|(Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: All tests)|(Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: All tests)|(Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: All tests)|(Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+)|(\t Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
 
 // CHECK: In testBundleDidFinish
diff --git a/Tests/Functional/Observation/Selected/main.swift b/Tests/Functional/Observation/Selected/main.swift
index 63c8c45..d68fcda 100644
--- a/Tests/Functional/Observation/Selected/main.swift
+++ b/Tests/Functional/Observation/Selected/main.swift
@@ -8,7 +8,7 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'Selected tests' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'Selected tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
 class Observer: XCTestObservation {
     var startedTestSuites = [XCTestSuite]()
@@ -46,7 +46,7 @@
     }
 }
 
-// CHECK: Test Suite 'ExecutedTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'ExecutedTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class ExecutedTestCase: XCTestCase {
     static var allTests = {
         return [
@@ -55,7 +55,7 @@
         ]
     }()
 
-// CHECK: Test Case 'ExecutedTestCase.test_executed' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'ExecutedTestCase.test_executed' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'ExecutedTestCase.test_executed' passed \(\d+\.\d+ seconds\)
     func test_executed() {
         let suiteNames = observer.startedTestSuites.map { $0.name }
@@ -70,15 +70,15 @@
 // There's no guarantee as to the order in which these two observers will be
 // called, so we match any order here.
 
-// CHECK: (In testSuiteDidFinish: ExecutedTestCase)|(Test Suite 'ExecutedTestCase' passed at \d+:\d+:\d+\.\d+|\t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
-// CHECK: (In testSuiteDidFinish: ExecutedTestCase)|(Test Suite 'ExecutedTestCase' passed at \d+:\d+:\d+\.\d+|\t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
-// CHECK: (In testSuiteDidFinish: ExecutedTestCase)|(Test Suite 'ExecutedTestCase' passed at \d+:\d+:\d+\.\d+|\t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: ExecutedTestCase)|(Test Suite 'ExecutedTestCase' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+|\t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: ExecutedTestCase)|(Test Suite 'ExecutedTestCase' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+|\t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: ExecutedTestCase)|(Test Suite 'ExecutedTestCase' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+|\t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
 
 XCTMain([
     testCase(SkippedTestCase.allTests),
     testCase(ExecutedTestCase.allTests),
 ])
 
-// CHECK: (In testSuiteDidFinish: Selected tests|Test Suite 'Selected tests' passed at \d+:\d+:\d+\.\d+)|(\t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
-// CHECK: (In testSuiteDidFinish: Selected tests|Test Suite 'Selected tests' passed at \d+:\d+:\d+\.\d+)|(\t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
-// CHECK: (In testSuiteDidFinish: Selected tests|Test Suite 'Selected tests' passed at \d+:\d+:\d+\.\d+)|(\t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: Selected tests|Test Suite 'Selected tests' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+)|(\t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: Selected tests|Test Suite 'Selected tests' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+)|(\t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
+// CHECK: (In testSuiteDidFinish: Selected tests|Test Suite 'Selected tests' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+)|(\t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds)
diff --git a/Tests/Functional/Performance/Misuse/main.swift b/Tests/Functional/Performance/Misuse/main.swift
index 4bbbb30..28f334e 100644
--- a/Tests/Functional/Performance/Misuse/main.swift
+++ b/Tests/Functional/Performance/Misuse/main.swift
@@ -8,13 +8,13 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'PerformanceMisuseTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'PerformanceMisuseTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class PerformanceMisuseTestCase: XCTestCase {
 
-    // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMultipleInOneTest_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMultipleInOneTest_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     func test_whenMeasuringMultipleInOneTest_fails() {
         // CHECK: .*/Misuse/main.swift:[[@LINE+1]]: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMultipleInOneTest_fails' measured.*
         measure {}
@@ -25,14 +25,14 @@
     }
     // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMultipleInOneTest_fails' failed \(\d+\.\d+ seconds\)
 
-    // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMetricsAndNotStartingOrEnding_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMetricsAndNotStartingOrEnding_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     func test_whenMeasuringMetricsAndNotStartingOrEnding_fails() {
         // CHECK: .*/Misuse/main.swift:[[@LINE+1]]: error: PerformanceMisuseTestCase.test_whenMeasuringMetricsAndNotStartingOrEnding_fails : API violation - startMeasuring\(\) must be called during the block.
         measureMetrics([XCTPerformanceMetric_WallClockTime], automaticallyStartMeasuring: false) {}
     }
     // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMetricsAndNotStartingOrEnding_fails' failed \(\d+\.\d+ seconds\)
 
-    // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMetricsAndStoppingWithoutStarting_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMetricsAndStoppingWithoutStarting_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     func test_whenMeasuringMetricsAndStoppingWithoutStarting_fails() {
         measureMetrics([XCTPerformanceMetric_WallClockTime], automaticallyStartMeasuring: false) {
             // CHECK: .*/Misuse/main.swift:[[@LINE+1]]: error: PerformanceMisuseTestCase.test_whenMeasuringMetricsAndStoppingWithoutStarting_fails : API violation - Cannot stop measuring before starting measuring.
@@ -41,7 +41,7 @@
     }
     // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMetricsAndStoppingWithoutStarting_fails' failed \(\d+\.\d+ seconds\)
 
-    // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMetricsAndStartingTwice_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMetricsAndStartingTwice_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     func test_whenMeasuringMetricsAndStartingTwice_fails() {
         measureMetrics([XCTPerformanceMetric_WallClockTime], automaticallyStartMeasuring: false) {
             self.startMeasuring()
@@ -51,7 +51,7 @@
     }
     // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMetricsAndStartingTwice_fails' failed \(\d+\.\d+ seconds\)
 
-    // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMetricsAndStoppingTwice_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMetricsAndStoppingTwice_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     func test_whenMeasuringMetricsAndStoppingTwice_fails() {
         measureMetrics([XCTPerformanceMetric_WallClockTime], automaticallyStartMeasuring: false) {
             self.startMeasuring()
@@ -62,21 +62,21 @@
     }
     // CHECK: Test Case 'PerformanceMisuseTestCase.test_whenMeasuringMetricsAndStoppingTwice_fails' failed \(\d+\.\d+ seconds\)
 
-    // CHECK: Test Case 'PerformanceMisuseTestCase.test_startMeasuringOutsideOfBlock_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceMisuseTestCase.test_startMeasuringOutsideOfBlock_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     func test_startMeasuringOutsideOfBlock_fails() {
         // CHECK: .*/Misuse/main.swift:[[@LINE+1]]: error: PerformanceMisuseTestCase.test_startMeasuringOutsideOfBlock_fails : API violation - Cannot start measuring. startMeasuring\(\) is only supported from a block passed to measureMetrics\(...\).
         startMeasuring()
     }
     // CHECK: Test Case 'PerformanceMisuseTestCase.test_startMeasuringOutsideOfBlock_fails' failed \(\d+\.\d+ seconds\)
 
-    // CHECK: Test Case 'PerformanceMisuseTestCase.test_stopMeasuringOutsideOfBlock_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceMisuseTestCase.test_stopMeasuringOutsideOfBlock_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     func test_stopMeasuringOutsideOfBlock_fails() {
         // CHECK: .*/Misuse/main.swift:[[@LINE+1]]: error: PerformanceMisuseTestCase.test_stopMeasuringOutsideOfBlock_fails : API violation - Cannot stop measuring. stopMeasuring\(\) is only supported from a block passed to measureMetrics\(...\).
         stopMeasuring()
     }
     // CHECK: Test Case 'PerformanceMisuseTestCase.test_stopMeasuringOutsideOfBlock_fails' failed \(\d+\.\d+ seconds\)
 
-    // CHECK: Test Case 'PerformanceMisuseTestCase.test_startMeasuringAfterBlock_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceMisuseTestCase.test_startMeasuringAfterBlock_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     func test_startMeasuringAfterBlock_fails() {
         // CHECK: .*/Misuse/main.swift:[[@LINE+1]]: Test Case 'PerformanceMisuseTestCase.test_startMeasuringAfterBlock_fails' measured.*
         measure {}
@@ -85,7 +85,7 @@
     }
     // CHECK: Test Case 'PerformanceMisuseTestCase.test_startMeasuringAfterBlock_fails' failed \(\d+\.\d+ seconds\)
 
-    // CHECK: Test Case 'PerformanceMisuseTestCase.test_stopMeasuringAfterBlock_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceMisuseTestCase.test_stopMeasuringAfterBlock_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     func test_stopMeasuringAfterBlock_fails() {
         // CHECK: .*/Misuse/main.swift:[[@LINE+1]]: Test Case 'PerformanceMisuseTestCase.test_stopMeasuringAfterBlock_fails' measured.*
         measure {}
@@ -94,14 +94,14 @@
     }
     // CHECK: Test Case 'PerformanceMisuseTestCase.test_stopMeasuringAfterBlock_fails' failed \(\d+\.\d+ seconds\)
 
-    // CHECK: Test Case 'PerformanceMisuseTestCase.test_measuringNoMetrics_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceMisuseTestCase.test_measuringNoMetrics_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     func test_measuringNoMetrics_fails() {
         // CHECK: .*/Misuse/main.swift:[[@LINE+1]]: error: PerformanceMisuseTestCase.test_measuringNoMetrics_fails : API violation - At least one metric must be provided to measure.
         measureMetrics([], automaticallyStartMeasuring: true) {}
     }
     // CHECK: Test Case 'PerformanceMisuseTestCase.test_measuringNoMetrics_fails' failed \(\d+\.\d+ seconds\)
 
-    // CHECK: Test Case 'PerformanceMisuseTestCase.test_measuringUnknownMetric_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceMisuseTestCase.test_measuringUnknownMetric_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     func test_measuringUnknownMetric_fails() {
         // CHECK: .*/Misuse/main.swift:[[@LINE+1]]: error: PerformanceMisuseTestCase.test_measuringUnknownMetric_fails : API violation - Unknown metric: UnladenAirspeedVelocity
         measureMetrics(["UnladenAirspeedVelocity"], automaticallyStartMeasuring: true) {}
@@ -124,12 +124,12 @@
         ]
     }()
 }
-// CHECK: Test Suite 'PerformanceMisuseTestCase' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'PerformanceMisuseTestCase' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed \d+ tests, with 12 failures \(12 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 XCTMain([testCase(PerformanceMisuseTestCase.allTests)])
 
-// CHECK: Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed \d+ tests, with \d+ failures \(\d+ unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed \d+ tests, with \d+ failures \(\d+ unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/Performance/main.swift b/Tests/Functional/Performance/main.swift
index 5dc19ac..fc0c86f 100644
--- a/Tests/Functional/Performance/main.swift
+++ b/Tests/Functional/Performance/main.swift
@@ -8,13 +8,13 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'PerformanceTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'PerformanceTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class PerformanceTestCase: XCTestCase {
 
-    // CHECK: Test Case 'PerformanceTestCase.test_measureBlockIteratesTenTimes' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceTestCase.test_measureBlockIteratesTenTimes' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     // CHECK: .*/Performance/main.swift:[[@LINE+4]]: Test Case 'PerformanceTestCase.test_measureBlockIteratesTenTimes' measured \[Time, seconds\] .*
     // CHECK: Test Case 'PerformanceTestCase.test_measureBlockIteratesTenTimes' passed \(\d+\.\d+ seconds\)
     func test_measureBlockIteratesTenTimes() {
@@ -25,7 +25,7 @@
         XCTAssertEqual(iterationCount, 10)
     }
 
-    // CHECK: Test Case 'PerformanceTestCase.test_measuresMetricsWithAutomaticStartAndStop' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceTestCase.test_measuresMetricsWithAutomaticStartAndStop' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     // CHECK: .*/Performance/main.swift:[[@LINE+4]]: Test Case 'PerformanceTestCase.test_measuresMetricsWithAutomaticStartAndStop' measured \[Time, seconds\] .*
     // CHECK: Test Case 'PerformanceTestCase.test_measuresMetricsWithAutomaticStartAndStop' passed \(\d+\.\d+ seconds\)
     func test_measuresMetricsWithAutomaticStartAndStop() {
@@ -36,7 +36,7 @@
         XCTAssertEqual(iterationCount, 10)
     }
 
-    // CHECK: Test Case 'PerformanceTestCase.test_measuresMetricsWithManualStartAndStop' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceTestCase.test_measuresMetricsWithManualStartAndStop' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     // CHECK: .*/Performance/main.swift:[[@LINE+3]]: Test Case 'PerformanceTestCase.test_measuresMetricsWithManualStartAndStop' measured \[Time, seconds\] .*
     // CHECK: Test Case 'PerformanceTestCase.test_measuresMetricsWithManualStartAndStop' passed \(\d+\.\d+ seconds\)
     func test_measuresMetricsWithManualStartAndStop() {
@@ -46,7 +46,7 @@
         }
     }
 
-    // CHECK: Test Case 'PerformanceTestCase.test_measuresMetricsWithoutExplicitStop' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceTestCase.test_measuresMetricsWithoutExplicitStop' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     // CHECK: .*/Performance/main.swift:[[@LINE+3]]: Test Case 'PerformanceTestCase.test_measuresMetricsWithoutExplicitStop' measured \[Time, seconds\] .*
     // CHECK: Test Case 'PerformanceTestCase.test_measuresMetricsWithoutExplicitStop' passed \(\d+\.\d+ seconds\)
     func test_measuresMetricsWithoutExplicitStop() {
@@ -55,20 +55,20 @@
         }
     }
 
-    // CHECK: Test Case 'PerformanceTestCase.test_hasWallClockAsDefaultPerformanceMetric' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceTestCase.test_hasWallClockAsDefaultPerformanceMetric' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     // CHECK: Test Case 'PerformanceTestCase.test_hasWallClockAsDefaultPerformanceMetric' passed \(\d+\.\d+ seconds\)
     func test_hasWallClockAsDefaultPerformanceMetric() {
         XCTAssertEqual(PerformanceTestCase.defaultPerformanceMetrics(), [XCTPerformanceMetric_WallClockTime])
     }
 
-    // CHECK: Test Case 'PerformanceTestCase.test_printsValuesAfterMeasuring' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceTestCase.test_printsValuesAfterMeasuring' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     // CHECK: .*/Performance/main.swift:[[@LINE+3]]: Test Case 'PerformanceTestCase.test_printsValuesAfterMeasuring' measured \[Time, seconds\] average: \d+.\d{3}, relative standard deviation: \d+.\d{3}%, values: \[\d+.\d{6}, \d+.\d{6}, \d+.\d{6}, \d+.\d{6}, \d+.\d{6}, \d+.\d{6}, \d+.\d{6}, \d+.\d{6}, \d+.\d{6}, \d+.\d{6}\], performanceMetricID:org.swift.XCTPerformanceMetric_WallClockTime, maxPercentRelativeStandardDeviation: \d+.\d{3}%, maxStandardDeviation: \d.\d{3}
     // CHECK: Test Case 'PerformanceTestCase.test_printsValuesAfterMeasuring' passed \(\d+\.\d+ seconds\)
     func test_printsValuesAfterMeasuring() {
         measure {}
     }
 
-    // CHECK: Test Case 'PerformanceTestCase.test_abortsMeasurementsAfterTestFailure' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceTestCase.test_abortsMeasurementsAfterTestFailure' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     func test_abortsMeasurementsAfterTestFailure() {
         var iterationCount = 0
         measure {
@@ -80,7 +80,7 @@
     }
     // CHECK: Test Case 'PerformanceTestCase.test_abortsMeasurementsAfterTestFailure' failed \(\d+\.\d+ seconds\)
 
-    // CHECK: Test Case 'PerformanceTestCase.test_measuresWallClockTimeInBlock' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'PerformanceTestCase.test_measuresWallClockTimeInBlock' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     func test_measuresWallClockTimeInBlock() {
         var hasWaited = false
         // CHECK: .*/Performance/main.swift:[[@LINE+2]]: Test Case 'PerformanceTestCase.test_measuresWallClockTimeInBlock' measured \[Time, seconds\] average: \d+.\d{3}, relative standard deviation: \d+.\d{3}%, values: \[1.\d{6}, 0.\d{6}, 0.\d{6}, 0.\d{6}, 0.\d{6}, 0.\d{6}, 0.\d{6}, 0.\d{6}, 0.\d{6}, 0.\d{6}\], performanceMetricID:org.swift.XCTPerformanceMetric_WallClockTime, maxPercentRelativeStandardDeviation: \d+.\d{3}%, maxStandardDeviation: \d.\d{3}
@@ -107,12 +107,12 @@
         ]
     }()
 }
-// CHECK: Test Suite 'PerformanceTestCase' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'PerformanceTestCase' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed \d+ tests, with 2 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 XCTMain([testCase(PerformanceTestCase.allTests)])
 
-// CHECK: Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed \d+ tests, with \d failures? \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed \d+ tests, with \d failures? \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/SelectedTest/main.swift b/Tests/Functional/SelectedTest/main.swift
index 1184d8d..8fb7d9c 100644
--- a/Tests/Functional/SelectedTest/main.swift
+++ b/Tests/Functional/SelectedTest/main.swift
@@ -12,10 +12,10 @@
     import XCTest
 #endif
 
-// CHECK-METHOD: Test Suite 'Selected tests' started at \d+:\d+:\d+\.\d+
-// CHECK-CLASS: Test Suite 'Selected tests' started at \d+:\d+:\d+\.\d+
-// CHECK-ALL: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK-ALL: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK-METHOD: Test Suite 'Selected tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK-CLASS: Test Suite 'Selected tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK-ALL: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK-ALL: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
 class ExecutedTestCase: XCTestCase {
     static var allTests = {
@@ -25,42 +25,42 @@
         ]
     }()
 
-// CHECK-METHOD:   Test Suite 'ExecutedTestCase' started at \d+:\d+:\d+\.\d+
-// CHECK-METHOD:   Test Case 'ExecutedTestCase.test_foo' started at \d+:\d+:\d+\.\d+
+// CHECK-METHOD:   Test Suite 'ExecutedTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK-METHOD:   Test Case 'ExecutedTestCase.test_foo' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK-METHOD:   Test Case 'ExecutedTestCase.test_foo' passed \(\d+\.\d+ seconds\)
-// CHECK-CLASS: Test Suite 'ExecutedTestCase' started at \d+:\d+:\d+\.\d+
-// CHECK-CLASS: Test Case 'ExecutedTestCase.test_bar' started at \d+:\d+:\d+\.\d+
+// CHECK-CLASS: Test Suite 'ExecutedTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK-CLASS: Test Case 'ExecutedTestCase.test_bar' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK-CLASS: Test Case 'ExecutedTestCase.test_bar' passed \(\d+\.\d+ seconds\)
-// CHECK-ALL:      Test Suite 'ExecutedTestCase' started at \d+:\d+:\d+\.\d+
-// CHECK-ALL:      Test Case 'ExecutedTestCase.test_bar' started at \d+:\d+:\d+\.\d+
+// CHECK-ALL:      Test Suite 'ExecutedTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK-ALL:      Test Case 'ExecutedTestCase.test_bar' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK-ALL:      Test Case 'ExecutedTestCase.test_bar' passed \(\d+\.\d+ seconds\)
     func test_bar() {}
 
-// CHECK-CLASS: Test Case 'ExecutedTestCase.test_foo' started at \d+:\d+:\d+\.\d+
+// CHECK-CLASS: Test Case 'ExecutedTestCase.test_foo' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK-CLASS: Test Case 'ExecutedTestCase.test_foo' passed \(\d+\.\d+ seconds\)
-// CHECK-ALL:      Test Case 'ExecutedTestCase.test_foo' started at \d+:\d+:\d+\.\d+
+// CHECK-ALL:      Test Case 'ExecutedTestCase.test_foo' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK-ALL:      Test Case 'ExecutedTestCase.test_foo' passed \(\d+\.\d+ seconds\)
     func test_foo() {}
 }
-// CHECK-METHOD:   Test Suite 'ExecutedTestCase' passed at \d+:\d+:\d+\.\d+
+// CHECK-METHOD:   Test Suite 'ExecutedTestCase' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK-METHOD:   \t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK-CLASS: Test Suite 'ExecutedTestCase' passed at \d+:\d+:\d+\.\d+
+// CHECK-CLASS: Test Suite 'ExecutedTestCase' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK-CLASS: \t Executed 2 tests, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK-ALL:      Test Suite 'ExecutedTestCase' passed at \d+:\d+:\d+\.\d+
+// CHECK-ALL:      Test Suite 'ExecutedTestCase' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK-ALL:      \t Executed 2 tests, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 
-// CHECK-ALL: Test Suite 'SkippedTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK-ALL: Test Suite 'SkippedTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class SkippedTestCase: XCTestCase {
     static var allTests = {
         return [("test_baz", test_baz)]
     }()
 
-// CHECK-ALL: Test Case 'SkippedTestCase.test_baz' started at \d+:\d+:\d+\.\d+
+// CHECK-ALL: Test Case 'SkippedTestCase.test_baz' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK-ALL: Test Case 'SkippedTestCase.test_baz' passed \(\d+\.\d+ seconds\)
     func test_baz() {}
 }
-// CHECK-ALL: Test Suite 'SkippedTestCase' passed at \d+:\d+:\d+\.\d+
+// CHECK-ALL: Test Suite 'SkippedTestCase' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK-ALL: \t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 XCTMain([
@@ -68,11 +68,11 @@
     testCase(SkippedTestCase.allTests),
 ])
 
-// CHECK-METHOD:   Test Suite 'Selected tests' passed at \d+:\d+:\d+\.\d+
+// CHECK-METHOD:   Test Suite 'Selected tests' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK-METHOD:   \t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK-CLASS: Test Suite 'Selected tests' passed at \d+:\d+:\d+\.\d+
+// CHECK-CLASS: Test Suite 'Selected tests' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK-CLASS: \t Executed 2 tests, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK-ALL:      Test Suite '.*\.xctest' passed at \d+:\d+:\d+\.\d+
+// CHECK-ALL:      Test Suite '.*\.xctest' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK-ALL:      \t Executed 3 tests, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK-ALL:      Test Suite 'All tests' passed at \d+:\d+:\d+\.\d+
+// CHECK-ALL:      Test Suite 'All tests' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK-ALL:      \t Executed 3 tests, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/SingleFailingTestCase/main.swift b/Tests/Functional/SingleFailingTestCase/main.swift
index 3ca38b7..09f7f46 100644
--- a/Tests/Functional/SingleFailingTestCase/main.swift
+++ b/Tests/Functional/SingleFailingTestCase/main.swift
@@ -8,10 +8,10 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'SingleFailingTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'SingleFailingTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class SingleFailingTestCase: XCTestCase {
     static var allTests = {
         return [
@@ -19,19 +19,19 @@
         ]
     }()
 
-    // CHECK: Test Case 'SingleFailingTestCase.test_fails' started at \d+:\d+:\d+\.\d+
+    // CHECK: Test Case 'SingleFailingTestCase.test_fails' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
     // CHECK: .*/SingleFailingTestCase/main.swift:[[@LINE+3]]: error: SingleFailingTestCase.test_fails : XCTAssertTrue failed -
     // CHECK: Test Case 'SingleFailingTestCase.test_fails' failed \(\d+\.\d+ seconds\)
     func test_fails() {
         XCTAssert(false)
     }
 }
-// CHECK: Test Suite 'SingleFailingTestCase' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'SingleFailingTestCase' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 1 test, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 XCTMain([testCase(SingleFailingTestCase.allTests)])
 
-// CHECK: Test Suite '.*\.xctest' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 1 test, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' failed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' failed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 1 test, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
diff --git a/Tests/Functional/TestCaseLifecycle/main.swift b/Tests/Functional/TestCaseLifecycle/main.swift
index ef9a823..3acc5b1 100644
--- a/Tests/Functional/TestCaseLifecycle/main.swift
+++ b/Tests/Functional/TestCaseLifecycle/main.swift
@@ -8,10 +8,10 @@
     import XCTest
 #endif
 
-// CHECK: Test Suite 'All tests' started at \d+:\d+:\d+\.\d+
-// CHECK: Test Suite '.*\.xctest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 
-// CHECK: Test Suite 'SetUpTearDownTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'SetUpTearDownTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class SetUpTearDownTestCase: XCTestCase {
     static var allTests = {
         return [
@@ -38,7 +38,7 @@
         print("In \(#function)")
     }
 
-// CHECK: Test Case 'SetUpTearDownTestCase.test_hasValueFromSetUp' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'SetUpTearDownTestCase.test_hasValueFromSetUp' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: In setUp\(\)
 // CHECK: In test_hasValueFromSetUp\(\)
 // CHECK: In tearDown\(\)
@@ -54,11 +54,11 @@
         print("In class \(#function)")
     }
 }
-// CHECK: Test Suite 'SetUpTearDownTestCase' passed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'SetUpTearDownTestCase' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 1 test, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 
-// CHECK: Test Suite 'NewInstanceForEachTestTestCase' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'NewInstanceForEachTestTestCase' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 class NewInstanceForEachTestTestCase: XCTestCase {
     static var allTests = {
         return [
@@ -69,20 +69,20 @@
 
     var value = 1
 
-// CHECK: Test Case 'NewInstanceForEachTestTestCase.test_hasInitializedValue' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'NewInstanceForEachTestTestCase.test_hasInitializedValue' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'NewInstanceForEachTestTestCase.test_hasInitializedValue' passed \(\d+\.\d+ seconds\)
     func test_hasInitializedValue() {
         XCTAssertEqual(value, 1)
         value += 1
     }
 
-// CHECK: Test Case 'NewInstanceForEachTestTestCase.test_hasInitializedValueInAnotherTest' started at \d+:\d+:\d+\.\d+
+// CHECK: Test Case 'NewInstanceForEachTestTestCase.test_hasInitializedValueInAnotherTest' started at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: Test Case 'NewInstanceForEachTestTestCase.test_hasInitializedValueInAnotherTest' passed \(\d+\.\d+ seconds\)
     func test_hasInitializedValueInAnotherTest() {
         XCTAssertEqual(value, 1)
     }
 }
-// CHECK: Test Suite 'NewInstanceForEachTestTestCase' passed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'NewInstanceForEachTestTestCase' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 2 tests, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
 
 
@@ -91,7 +91,7 @@
     testCase(NewInstanceForEachTestTestCase.allTests)
 ])
 
-// CHECK: Test Suite '.*\.xctest' passed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite '.*\.xctest' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 3 tests, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
-// CHECK: Test Suite 'All tests' passed at \d+:\d+:\d+\.\d+
+// CHECK: Test Suite 'All tests' passed at \d+-\d+-\d+ \d+:\d+:\d+\.\d+
 // CHECK: \t Executed 3 tests, with 0 failures \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds