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javaandroiddatetimer

How to get number of milliseconds from start of day

For example, if it's 1 p.m (13:00) and I need to get the number 46800000 (13 hours from beginning o day) in milliseconds. Could anyone please help?

Solution

  • You can use a Calendar to calculate it. You set the time to the hour 0 and calculate the difference:

    Calendar c = Calendar.getInstance();
c.set(Calendar.HOUR_OF_DAY, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
c.set(Calendar.MILLISECOND, 0);
long millis = (System.currentTimeMillis() - c.getTimeInMillis());