Here you can find the source of dateFormat(Object obj, String parten)
public static String dateFormat(Object obj, String parten)
//package com.java2s; /**/* ww w.jav a2 s. c om*/ * Copyright 2010-2016 the original author or authors. * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * 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. */ import java.text.SimpleDateFormat; public class Main { public static String dateFormat(Object obj, String parten) { if (obj == null) return null; if (parten == null || parten.trim().length() == 0) parten = "yyyy-MM-dd"; SimpleDateFormat dateFormat = new SimpleDateFormat(parten); if (obj instanceof java.sql.Date) { return dateFormat.format(obj); } else if (obj instanceof java.util.Date) { return dateFormat.format(obj); } else { return obj.toString(); } } }