The Calendar Class : Date « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. Date

import java.util.Calendar;
import java.util.Date;

public class MainClass {
  public static void main(String[] args) {
    Date d1 = new Date(1000000000000L);
    System.out.println("1st date " + d1.toString());

    Calendar c = Calendar.getInstance();
    c.setTime(d1);

    if (Calendar.SUNDAY == c.getFirstDayOfWeek()) {
      System.out.println("Sunday is the first day of the week");
    }
    System.out.println("trillionth milli day of week is " + c.get(Calendar.DAY_OF_WEEK));

    c.add(Calendar.MONTH, 1);
    Date d2 = c.getTime();
    System.out.println("new date " + d2.toString());
  }
}

1st date Sat Sep 08 18:46:40 PDT 2001
Sunday is the first day of the week
trillionth milli day of week is 7
new date Mon Oct 08 18:46:40 PDT 2001