Here you can find the source of format(Date date)
public static String format(Date date)
//package com.java2s; /*//from w ww . j a v a2 s. c o m * Copyright 2016 Dmitriy Malakhov. * * 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.text.SimpleDateFormat; import java.util.Date; public class Main { public static final ThreadLocal<SimpleDateFormat> SDF = new ThreadLocal<SimpleDateFormat>() { @Override public SimpleDateFormat get() { SimpleDateFormat sdf = super.get(); if (sdf == null) { sdf = new SimpleDateFormat("yyyyMMddHHmmss"); set(sdf); } return sdf; } }; public static String format(Date date) { return SDF.get().format(date); } }