Here you can find the source of getTimezoneDifference(String timezone1, String timezone2)
public static int getTimezoneDifference(String timezone1, String timezone2)
//package com.java2s; /**/*from w w w . j a v a 2 s .c o m*/ * Copyright (c) 2013 M. Alexander Nugent Consulting <i@alexnugent.name> * * M. Alexander Nugent Consulting Research License Agreement * Non-Commercial Academic Use Only * * This Software is proprietary. By installing, copying, or otherwise using this * Software, you agree to be bound by the terms of this license. If you do not agree, * do not install, copy, or use the Software. The Software is protected by copyright * and other intellectual property laws. * * You may use the Software for non-commercial academic purpose, subject to the following * restrictions. You may copy and use the Software for peer-review and methods verification * only. You may not create derivative works of the Software. You may not use or distribute * the Software or any derivative works in any form for commercial or non-commercial purposes. * * Violators will be prosecuted to the full extent of the law. * * All rights reserved. No warranty, explicit or implicit, provided. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARR?ANTY 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. */ import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; import java.util.TimeZone; public class Main { public static int getTimezoneDifference(String timezone1, String timezone2) { // Timezone1 Calendar lCalendar = new GregorianCalendar(TimeZone.getTimeZone(timezone1)); lCalendar.setTimeInMillis(new Date().getTime()); int Timezone1HourOfDay = lCalendar.get(Calendar.HOUR_OF_DAY); int Timezone1DayOfMonth = lCalendar.get(Calendar.DAY_OF_MONTH); // Timezone2 lCalendar = new GregorianCalendar(TimeZone.getTimeZone(timezone2)); lCalendar.setTimeInMillis(new Date().getTime()); int TimezoneHourOfDay = lCalendar.get(Calendar.HOUR_OF_DAY); int TimezoneDayOfMonth = lCalendar.get(Calendar.DAY_OF_MONTH); int hourDifference = Timezone1HourOfDay - TimezoneHourOfDay; int dayDifference = Timezone1DayOfMonth - TimezoneDayOfMonth; if (dayDifference != 0) { hourDifference = hourDifference + 24; } return hourDifference; } }