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// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
library fuchsia.timezone;
// TODO(US-384): Update protocol for more stuctured data: timezone names,
// standard timezone codenames, and DST start/end information
// (see go/garnet-time).
// For more information on the ICU timezone ID format, see:
protocol Timezone {
/// Returns local timezone offset (in minutes from UTC. Can be negative) for
/// the supplied number of milliseconds since the Unix epoch. Returns a
/// non-zero DST offset when appropriate.
GetTimezoneOffsetMinutes(int64 milliseconds_since_epoch)
-> (int32 local_offset_minutes, int32 dst_offset_minutes);
/// Sets the timezone for the machine based on an ICU ID.
SetTimezone(string timezone_id) -> (bool status);
/// Gets the timezone ID string.
GetTimezoneId() -> (string timezone_id);
/// Watches for updates to the timezone ID.
Watch(TimezoneWatcher watcher);
protocol TimezoneWatcher {
/// When the timezone changes, returns the new timezone ID.
OnTimezoneOffsetChange(string timezone_id);