Here you can find the source of getUnixTimeSeconds()
public static int getUnixTimeSeconds()
//package com.java2s; /**//from w w w .ja v a 2 s .c om * Copyright (c) 2014 Virtue Studios * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions\: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ public class Main { private static long timeCorrection; private static long lastTimeUpdate; public static int getUnixTimeSeconds() { return (int) (System.currentTimeMillis() / 1000); } public static synchronized long currentTimeMillis() { long l = System.currentTimeMillis(); if (l < lastTimeUpdate) timeCorrection += lastTimeUpdate - l; lastTimeUpdate = l; return l + timeCorrection; } }