Here you can find the source of getDateTimeString(String format)
public static String getDateTimeString(String format)
//package com.java2s; import java.util.Calendar; import java.sql.Timestamp; import java.text.SimpleDateFormat; public class Main { public static String getDateTimeString(String format) { return toDateTimeString(new java.util.Date(), format); }/*from www . jav a2 s . co m*/ public static String getDateTimeString() { return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(nowDate()); } public static String toDateTimeString(java.util.Date date) { if (date == null) return ""; String dateString = toDateString(date); String timeString = toTimeString(date); if (dateString == null || timeString == null) return ""; return dateString + " " + timeString; } public static String toDateTimeString(Calendar calendar) { return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(calendar.getTime()); } public static String toDateTimeString(Calendar calendar, String format) { return toDateTimeString(calendar.getTime(), format); } public static String toDateTimeString(long datetime) { return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new java.util.Date(datetime)); } public static String toDateTimeString(long datetime, String format) { SimpleDateFormat sdf = new SimpleDateFormat(format); return sdf.format(new java.util.Date(datetime)); } public static String toDateTimeString(java.util.Date date, String format) { SimpleDateFormat sdf = new SimpleDateFormat(format); return sdf.format(date); } public static String toDateTimeString(Timestamp time) { long datetime = time.getTime(); return toDateTimeString(datetime); } public static String toDateTimeString(java.sql.Date date) { long datetime = date.getTime(); return toDateTimeString(datetime); } public static java.util.Date nowDate() { return new java.util.Date(); } public static String toDateString(java.util.Date date, String spe) { if (date == null) return ""; Calendar calendar = Calendar.getInstance(); calendar.setTime(date); int month = calendar.get(Calendar.MONTH) + 1; int day = calendar.get(Calendar.DAY_OF_MONTH); int year = calendar.get(Calendar.YEAR); String monthStr = "" + month; String dayStr = "" + day; String yearStr = "" + year; if (month < 10) monthStr = "0" + month; if (day < 10) dayStr = "0" + day; return yearStr + spe + monthStr + spe + dayStr; } public static String toDateString(java.util.Date date) { return toDateString(date, "-"); } public static String toDateString(Calendar calendar) { return new SimpleDateFormat("yyyy-MM-dd").format(calendar.getTime()); } public static String toTimeString(java.util.Date date) { if (date == null) return ""; Calendar calendar = Calendar.getInstance(); calendar.setTime(date); return toTimeString(calendar.get(Calendar.HOUR_OF_DAY), calendar.get(Calendar.MINUTE), calendar.get(Calendar.SECOND)); } public static String toTimeString(int hour, int minute, int second) { String hourStr = "" + hour; String minuteStr = "" + minute; String secondStr = "" + second; if (hour < 10) hourStr = "0" + hour; if (minute < 10) minuteStr = "0" + minute; if (second < 10) secondStr = "0" + second; return hourStr + ":" + minuteStr + ":" + secondStr; } }