Here you can find the source of format(java.util.Date date)
public static String format(java.util.Date date)
//package com.java2s; //License from project: Apache License import java.text.SimpleDateFormat; public class Main { public static String format(java.util.Date date) { return date == null ? "" : format(date, "yyyy-MM-dd"); }//ww w. j a va 2 s. com public static String format(java.util.Date date, String pattern) { return date == null ? "" : new SimpleDateFormat(pattern).format(date); } }