Here you can find the source of format()
protected static SimpleDateFormat format()
//package com.java2s; /**// ww w . j a va 2 s . c o m * Copyright (c) 2015 The original author or authors * <p> * 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 * <p> * http://www.apache.org/licenses/LICENSE-2.0 * <p> * 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 { protected static SimpleDateFormat format() { return new SimpleDateFormat("yyyy_MM_dd"); } }