Here you can find the source of format8chars(long timestamp)
public static String format8chars(long timestamp)
//package com.java2s; /*//from ww w . ja v a 2s.com * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. The ASF 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. For additional information regarding * copyright in this work, please see the NOTICE file in the top level * directory of this distribution. */ import java.text.SimpleDateFormat; import java.util.Date; public class Main { private static final String format8chars = "yyyyMMdd"; public static String format8chars(long timestamp) { return format8chars(new Date(timestamp)); } public static String format8chars(Date date) { return format(date, get8charDateFormat()); } /** * Returns a string the represents the passed-in date parsed * according to the passed-in format. Returns an empty string * if the date or the format is null. **/ public static String format(Date aDate, SimpleDateFormat aFormat) { if (aDate == null || aFormat == null) { return ""; } synchronized (aFormat) { return aFormat.format(aDate); } } public static SimpleDateFormat get8charDateFormat() { return new SimpleDateFormat(format8chars); } }