Here you can find the source of dateTime2Str(Date date, String pattern)
public static String dateTime2Str(Date date, String pattern)
//package com.java2s; import java.text.SimpleDateFormat; import java.util.Date; public class Main { public static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss"; public static String dateTime2Str(Date date, String pattern) { if (null == date) { return null; }/*from w w w .j a va 2 s . com*/ if (null == pattern) { pattern = DEFAULT_DATE_TIME_FORMAT; } SimpleDateFormat format = new SimpleDateFormat(); format.applyPattern(pattern); return format.format(date); } }