Here you can find the source of getDefaultDateTimeString(long date, Locale locale)
public static String getDefaultDateTimeString(long date, Locale locale)
//package com.java2s; import java.text.DateFormat; import java.util.Date; import java.util.HashMap; import java.util.Locale; import java.util.Map; public class Main { private static final Map<String, DateFormat> dateFormats = new HashMap<String, DateFormat>(); public static String getDefaultDateTimeString(long date, Locale locale) { return getDateTimeString(new Date(date), DateFormat.DEFAULT, locale); }/*from w w w.j av a2 s.c om*/ public static String getDefaultDateTimeString(String date, Locale locale) { try { long millis = Long.parseLong(date); return getDateTimeString(new Date(millis), DateFormat.DEFAULT, locale); } catch (Exception e) { return ""; } } private static String getDateTimeString(Date date, int format, Locale currentLocale) { String key = format + "_" + currentLocale.toString(); DateFormat formatter = dateFormats.get(key); if (formatter == null) { formatter = DateFormat.getDateTimeInstance(format, format, currentLocale); dateFormats.put(key, formatter); } return formatter.format(date); } }