Question

I need to set an alarm on a user’s phone. This is an android function, and the alarm takes the time to fire in System.currentTimeMillis() format. I want to set the alarm at 7pm on the user’s phone, but I don’t know what timezone the user has their phone set to.

How can I figure out what the equivalent time at 7pm for the current day is in UTC (currentTimeMillis()) ?

Thanks

Answer 1

Calendar cal = Calendar.getInstance(); // returns current time in user's default TimeZone
cal.set(Calendar.MILLISECOND, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.HOUR_OF_DAY, 19);
long time = cal.getTime().getTime();