System Clock

setSystemAlarmAsync(alarm)

Android only. Sends an AlarmClock.ACTION_SET_ALARM intent to create an alarm in the user’s Clock app. Returns false if no compatible Clock activity is available.

const created = await AlarmScheduler.setSystemAlarmAsync({
  hour: 8,
  minute: 0,
  title: 'Leave for work',
  weekdays: [1, 2, 3, 4, 5],
  showUi: true,
});

Takes the same AlarmScheduleInput as scheduleAlarmAsync, but only hour, minute, title, weekdays and showUi are meaningful — the alarm belongs to the Clock app, so the ios and android presentation blocks do not apply.

openSystemAlarmAppAsync()

Opens the Android system Clock alarm screen via AlarmClock.ACTION_SHOW_ALARMS.

const opened = await AlarmScheduler.openSystemAlarmAppAsync();

On iOS this uses a best-effort Clock URL and may return false or do nothing depending on the OS version.

See the System Clock guide for when to use these instead of app-owned alarms.