Here you can find the source of getUTCCalendar()
private static Calendar getUTCCalendar()
//package com.java2s; /**//from ww w . j a v a2 s . co m * 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; import java.util.TimeZone; public class Main { private static final ThreadLocal<Calendar> parquetUTCCalendar = new ThreadLocal<Calendar>(); private static Calendar getUTCCalendar() { //Calendar.getInstance calculates the current-time needlessly, so cache an instance. if (parquetUTCCalendar.get() == null) { parquetUTCCalendar.set(Calendar.getInstance(TimeZone .getTimeZone("UTC"))); } return parquetUTCCalendar.get(); } }