Here you can find the source of toDay(long millis)
private static long toDay(long millis)
//package com.java2s; /**/*from w w w . j a v a 2 s . c o m*/ * Copyright 2013-present febit.org (support@febit.org) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.TimeZone; public class Main { public static final long MILLIS_IN_DAY = 1000L * 60 * 60 * 24; private static long toDay(long millis) { return (millis + TimeZone.getDefault().getRawOffset()) / MILLIS_IN_DAY; } }