Java tutorial
//package com.java2s; /* * Copyright JiongBull 2016 * * 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.Calendar; public class Main { public static long getUtcMillis(final long millis) { Calendar calendar = getCalendar(millis); long offset = calendar.get(Calendar.ZONE_OFFSET); return millis - offset; } public static Calendar getCalendar(final long millis) { Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(millis); return calendar; } }