Here you can find the source of setTimeTo0(final Calendar calendar)
private static void setTimeTo0(final Calendar calendar)
//package com.java2s; import java.util.Calendar; public class Main { private static void setTimeTo0(final Calendar calendar) { calendar.set(Calendar.HOUR_OF_DAY, 0); calendar.set(Calendar.MINUTE, 0); calendar.set(Calendar.SECOND, 0); calendar.set(Calendar.MILLISECOND, 0); }//from w w w .j a v a 2s . c om }