I am encountered one issue with Android's alarm manager. I am scheduling a
repeating notification on DST enabled area.
Here are my timezone settings
- Region: Canada
- TimeZone: Vancouver
- Device: S9+ Android 10
- DST Starts on - **March 8** & DST ends on - **Nov-1**
I scheduled a notification on **February 29 at 9:00 AM** notification comes
successfully, but **after DST Starts** on **March 9th** the notification
fired at **10:00 AM**. after DST ends it is back to normal.
I need to fire the notification at exactly 9:00 AM every day independent of
DST. Is this behavior is normal? there are no issues with iOS devices.
- Is this is a bug from the Android side?
- How to schedule the notification independent of DST?
Can anyone help me?
Here is my code to schedule the notification
**Note: I have added the AlarmManager.RTC_WAKEUP as the alarm type and
scheduled the interval as AlarmManager.INTERVAL_DAY. also, passed the UTC
time to the alarm manager from the calendars calendar.getTimeInMillis()
method.**
alarmMgr = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, AlarmReceiver.class);
alarmIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, 9);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);
alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP,
calendar.getTimeInMillis(),
AlarmManager.INTERVAL_DAY, alarmIntent);
**Test Procedure:**
Setting the **Region: Canada & TimeZone: Vancouver**
1. Schedule a repeating notification on Feb 15th at 9:00 AM
2. Test whether the notification fired on Feb 16th at 9:00 AM ->
**Success, notification fired at 9:00 AM**
3. change the system time to March 9th (Which is on DST); observing the
notification fires at 9:00 AM -> **Failed, it fired on 10:00 AM**
4. Change the date to Nov 2nd (DST Ended) ; observing the notification
fires at 9:00AM -> **Success notification fired at 9:00 AM**
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