Calendar sample code

import java.util.Date;import java.util.Calendar;import java.text.SimpleDateFormat;import java.util.*;
public class CalendarExample {private static void prt(String s) { System.out.println(s); }
private static void prt() { System.out.println(); }
private static void doCalendarTimeExample() { prt("CURRENT DATE/TIME"); prt("================================================================="); Date now = Calendar.getInstance().getTime(); prt(" Calendar.getInstance().getTime() : " + now); prt(); }private static void doSimpleDateFormat() { prt("SIMPLE DATE FORMAT"); prt("=================================================================");
Calendar now = Calendar.getInstance(); SimpleDateFormat formatter = new SimpleDateFormat("E yyyy.MM.dd 'at' hh:mm:ss a zzz"); prt(" It is now : " + formatter.format(now.getTime())); prt(); }private static void doAdd() {
prt("ADD / SUBTRACT CALENDAR / DATEs"); prt("=================================================================");
Calendar now = Calendar.getInstance(); Calendar working; SimpleDateFormat formatter = new SimpleDateFormat("E yyyy.MM.dd 'at' hh:mm:ss a zzz");
working = (Calendar) now.clone(); working.add(Calendar.DAY_OF_YEAR, - (365 * 2)); prt(" Two years ago it was: " + formatter.format(working.getTime()));
working = (Calendar) now.clone(); working.add(Calendar.DAY_OF_YEAR, + 5); prt(" In five days it will be: " + formatter.format(working.getTime()));
prt();
}
private static void doDateDifference() { prt("DIFFERENCE BETWEEN TWO DATES"); prt("================================================================="); Date startDate1 = new GregorianCalendar(1994, 02, 14, 14, 00).getTime(); Date endDate1 = new Date();;
long diff = endDate1.getTime() - startDate1.getTime();
prt(" Difference between " + endDate1); prt(" and " + startDate1 + " is " + (diff / (1000L*60L*60L*24L)) + " days."); prt();
}
private static void doGetMethods() {
prt("CALENDAR GET METHODS"); prt("================================================================="); Calendar c = Calendar.getInstance();
prt(" YEAR : " + c.get(Calendar.YEAR)); prt(" MONTH : " + c.get(Calendar.MONTH)); prt(" DAY_OF_MONTH : " + c.get(Calendar.DAY_OF_MONTH)); prt(" DAY_OF_WEEK : " + c.get(Calendar.DAY_OF_WEEK)); prt(" DAY_OF_YEAR : " + c.get(Calendar.DAY_OF_YEAR)); prt(" WEEK_OF_YEAR : " + c.get(Calendar.WEEK_OF_YEAR)); prt(" WEEK_OF_MONTH : " + c.get(Calendar.WEEK_OF_MONTH)); prt(" DAY_OF_WEEK_IN_MONTH : " + c.get(Calendar.DAY_OF_WEEK_IN_MONTH)); prt(" HOUR : " + c.get(Calendar.HOUR)); prt(" AM_PM : " + c.get(Calendar.AM_PM)); prt(" HOUR_OF_DAY (24-hour): " + c.get(Calendar.HOUR_OF_DAY)); prt(" MINUTE : " + c.get(Calendar.MINUTE)); prt(" SECOND : " + c.get(Calendar.SECOND)); prt();
}
public static void main(String[] args) { prt(); doCalendarTimeExample(); doSimpleDateFormat(); doAdd(); doDateDifference(); doGetMethods(); }
}