Here you can find the source of tzOffsetToQ(final long dt)
static long tzOffsetToQ(final long dt)
//package com.java2s; /**/*from ww w .j a v a 2 s . c o m*/ * Copyright (c) 2011-2014 Exxeleron GmbH * * 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.TimeZone; public class Main { static final TimeZone TIME_ZONE = TimeZone.getDefault(); static long tzOffsetToQ(final long dt) { return dt - TIME_ZONE.getOffset(dt - TIME_ZONE.getOffset(dt)); } }