cmake: Set nightly start time to UTC.
diff --git a/CTestConfig.cmake b/CTestConfig.cmake
index ad7b80c..30a2155 100644
--- a/CTestConfig.cmake
+++ b/CTestConfig.cmake
@@ -1,7 +1,7 @@
 set(UPDATE_TYPE "true")
 
 set(CTEST_PROJECT_NAME "cmocka")
-set(CTEST_NIGHTLY_START_TIME "01:00:00 CET")
+set(CTEST_NIGHTLY_START_TIME "01:00:00 UTC")
 
 set(CTEST_DROP_METHOD "http")
 set(CTEST_DROP_SITE "mock.cryptomilk.org")