Java Utililty Methods Random Date

String generateRandomDate()
generate Random Date

Random r = new Random();
java.util.Calendar c = java.util.Calendar.getInstance();
c.set(java.util.Calendar.MONTH, Math.abs(r.nextInt()) % 12);
c.set(java.util.Calendar.DAY_OF_MONTH, Math.abs(r.nextInt()) % 30);
c.setLenient(true);
return DATE_FORMAT.format(c.getTime());

String getDateRandom()
get Date Random

String s = new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date());
return s;

String getDateRand(Date date)
get Date Rand

String str = sdf.format(date);
double d = Math.random();
int t = 1000 + (int) (d * 9000.0D);
return str + t;

String getDateRand()
get Date Rand

Calendar c = Calendar.getInstance(Locale.CHINA);
Date d = c.getTime();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
return sdf.format(d) + (int) (Math.random() * 10);

String getDateRandomId()
return a ID contruct on with the current date : sample : 20101223-4687

DateFormat format = new SimpleDateFormat("yyyyMMdd", Locale.US);
NumberFormat formatter = new DecimalFormat("00000");
String newDateId;
do {
 Calendar today = Calendar.getInstance();
 int daySec = today.get(Calendar.HOUR_OF_DAY) * 24 * 60 + today.get(Calendar.MINUTE) * 60
 + today.get(Calendar.SECOND);
 String currentDate = format.format(today.getTime());
...

String getRandomDate(Random ran, boolean idNewID)
get Random Date

if (ran == null) {
 return "";
int year = 0;
if (idNewID) {
 year = 1900 + ran.nextInt(2007 - 1900);
} else {
 year = 1 + ran.nextInt(99);
...

String getRandomDate()
get Random Date

long time = System.currentTimeMillis();
Date dat = new Date(time);
GregorianCalendar gc = new GregorianCalendar();
gc.setTime(dat);
java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
return format.format(gc.getTime());