Here you can find the source of getTimeZone(Calendar cal)
public static TimeZone getTimeZone(Calendar cal)
//package com.java2s; /*// ww w . j a va 2 s .c o m // Licensed to DynamoBI Corporation (DynamoBI) under one // or more contributor license agreements. See the NOTICE file // distributed with this work for additional information // regarding copyright ownership. DynamoBI licenses this file // to you 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.*; public class Main { /** * the Java default time zone */ public static final TimeZone defaultZone = TimeZone.getDefault(); /** * Gets the active time zone based on a Calendar argument */ public static TimeZone getTimeZone(Calendar cal) { if (cal == null) { return defaultZone; } return cal.getTimeZone(); } }