Some common uses of Calendar, such as determining whether the same day

1, Calendar to determine whether the same day code is as follows :

Idea: The time format of two date types into the calendar type is compared to the date of two events

	public static Boolean issameday (date date1, date date2) {
		Calendar Caldatea = Calendar.getinstance ();
		Caldatea.settime (date1);

		Calendar caldateb = Calendar.getinstance ();
		Caldateb.settime (date2);

		Return Caldatea.get (calendar.year) = = Caldateb.get (calendar.year)
				&& caldatea.get (calendar.month) = = Caldateb.get (calendar.month)
				&& caldatea.get (calendar.day_of_month) = = Caldateb
						. Get (Calendar.day _of_month);
	}

2, Calendar calculation current time known current date

	public static String getyearandmonthday (int dayofmonth) {
		Calendar rightnow = Calendar.getinstance ();
		Date today = new Date (System.currenttimemillis ());
		Rightnow.settime (today);
		Rightnow.add (Calendar.month, 1); Righthow.add (calendar.month,1) return
			(Rightnow.get (calendar.year) + "year" +rightnow.get (calendar.month)) + "Month" + DayOfMonth + "Day";
	}
	

3, calendar calculation One months after the Today

	public static String getnextdate (int dayofmonth) {
		Calendar rightnow = Calendar.getinstance ();
		Date today = new Date (System.currenttimemillis ());
		Rightnow.settime (today);
		int day = Rightnow.get (calendar.day_of_month+1);
			Return Rightnow.get (calendar.year) + "-" + (Rightnow.get (calendar.month) + 2) + "-" + DayOfMonth;
	}

4, two time difference how much

	public static final int Getdayfromtimediff (date d1, date D2) {
		if (D1 = = NULL | | d2 = NULL) {return
			0;
		}
		long L1 = D1.gettime ();
		Long L2 = D2.gettime ();
		Long diff = l2-l1;
		int day = (int) (diff/(1000 * 3600 *));
		return day;
	}