Java tutorial
//package com.java2s; import java.util.Calendar; public class Main { private static long getYesterdayZeroTime() { Calendar cal = Calendar.getInstance(); cal.set(Calendar.HOUR_OF_DAY, -24); cal.set(Calendar.SECOND, 0); cal.set(Calendar.MINUTE, 0); cal.set(Calendar.MILLISECOND, 0); return cal.getTimeInMillis(); } }