Here you can find the source of toDate(long value, String format)
public static Date toDate(long value, String format)
//package com.java2s; /*//from w ww.j ava 2 s . c o m * Copyright (C) 2014-2016 LinkedIn Corp. All rights reserved. * * 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. */ import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class Main { public static Date toDate(long value, String format) { SimpleDateFormat fmt = new SimpleDateFormat(format); Date date = null; try { date = fmt.parse(Long.toString(value)); } catch (ParseException e) { e.printStackTrace(); } return date; } public static Date toDate(Date date, String format) { SimpleDateFormat fmt = new SimpleDateFormat(format); String dateStr = fmt.format(date); Date outDate = null; try { outDate = fmt.parse(dateStr); } catch (ParseException e) { e.printStackTrace(); } return outDate; } }