...
now = new Date();
dateTimeString = DateFormat.getDateTimeInstance().format(now);
dateString = DateFormat.getDateInstance().format(now);
timeString = DateFormat.getTimeInstance().format(now);
today = new GregorianCalendar();
today.setTime(now);
String weekDay[] = new DateFormatSymbols().getWeekdays();
dayOfWeekString = weekDay[today.get(Calendar.DAY_OF_WEEK)];
try {
System.setProperty("DateTime", dateTimeString);
System.setProperty("Date", dateString);
System.setProperty("Time", timeString);
System.setProperty("DayOfWeek", dayOfWeekString);
} 
catch (Exception e) {
System.out.println("Date or time unknown.");
}
...