Here you can find the source of formatDate(Date date, String pattern)
public static String formatDate(Date date, String pattern)
//package com.java2s; //License from project: Apache License import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; public class Main { public static String DEFAULTFORMAT = "yyyy-MM-dd HH:mm:ss"; public static String formatDate(Date date, String pattern) { if (date == null) return ""; Calendar calendar = Calendar.getInstance(); calendar.setTime(date);// ww w . j a v a 2s . c o m return formatCalendar(calendar, pattern); } public static String formatDate(Date date) { return formatDate(date, DEFAULTFORMAT); } public static String formatCalendar(Calendar calendar) { return formatCalendar(calendar, DEFAULTFORMAT); } public static String formatCalendar(Calendar calendar, String pattern) { SimpleDateFormat sdf = new SimpleDateFormat(pattern); //sdf.setTimeZone(TimeZone.getTimeZone(timeZone)); return sdf.format(calendar.getTime()); } }