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Get milliseconds until midnight

Asked 2012-08-16T14:36:30.337
36

I'm creating an Android widget that I want to update every night at midnight. I am using an AlarmManager and I need to find out how many milliseconds are left from the current time until midnight. Here's my code:

AlarmManager mAlarmManager = (AlarmManager)context.getSystemService(android.content.Context.ALARM_SERVICE);
mAlarmManager.set(AlarmManager.ELAPSED_REALTIME, millisecondsUntilMidnight, mSrvcPendingingIntent);

How can I calculate how many milliseconds are left until midnight?

Thank you in advance.

java android date milliseconds
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2 Answers

58

Use a Calendar to compute it :

        Calendar c = Calendar.getInstance();
        c.add(Calendar.DAY_OF_MONTH, 1);
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        long howMany = (c.getTimeInMillis()-System.currentTimeMillis());
answered 2012-08-16T14:42:09.530
0

You could use AlarmManager.RTC instead of AlarmManager.ELAPSED_REALTIME, and just set a Calendar to the time you want :

// Create a calendar for midnight
Calendar todayMidnight = Calendar.getInstance();
todayMidnight.add(Calendar.DATE, 1);
todayMidnight.set(Calendar.HOUR_OF_DAY, 0);
todayMidnight.set(Calendar.MINUTE, 0);
todayMidnight.set(Calendar.SECOND, 0);

// Create an alarm going off at midnight
mAlarmManager.set(
   AlarmManager.RTC, 
   todayMidnight.getTimeInMillis(), 
   mSrvcPendingingIntent
);
answered 2013-06-14T14:55:04.533

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