Java tutorial
//package com.java2s; /* Copyright 2010 Sean Dague This file is part of Where is Io Where is Io is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Where is Io is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Where is Io. If not, see <http://www.gnu.org/licenses/>. */ import java.util.TimeZone; public class Main { public static long JD2mils(double jd) { return (long) ((jd - 2440587.5) * 86400 * 1000); } public static long JD2mils(double jd, TimeZone tz) { long mils = JD2mils(jd); return mils - tz.getOffset(mils); } }