Here you can find the source of formatYearMonth(Date date)
public static String formatYearMonth(Date date)
//package com.java2s; /*//from w ww .j av a 2 s.c om * Copyright 2010 Mttang.com All right reserved. This software is the * confidential and proprietary information of Mttang.com ("Confidential * Information"). You shall not disclose such Confidential Information and shall * use it only in accordance with the terms of the license agreement you entered * into with Mttang.com. */ import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class Main { static final SimpleDateFormat yyyyMM = new SimpleDateFormat("yyyy-MM"); public static Date formatYearMonth(String day) { try { return yyyyMM.parse(day); } catch (ParseException ex) { ex.printStackTrace(); return new java.util.Date(); } } public static String formatYearMonth(Date date) { try { return yyyyMM.format(date); } catch (Exception ex) { ex.printStackTrace(); } return null; } }