dateandtimetests.cs

大名鼎鼎的mono是.NET平台的跨平台（支持linux

			Assert.AreEqual(DateTime.Parse("12/4/2003 23:58:00"),DateAndTime.DateAdd("n", -2, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("10/5/2003 00:00:00"),DateAndTime.DateAdd("m", -2, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("6/5/2003 00:00:00"),DateAndTime.DateAdd("q", -2, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/4/2003 23:59:58"),DateAndTime.DateAdd("s", -2, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/3/2003 00:00:00"),DateAndTime.DateAdd("w", -2, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("11/21/2003 00:00:00"),DateAndTime.DateAdd("ww", -2, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2001 00:00:00"),DateAndTime.DateAdd("yyyy", -2, DateTime.Parse("12/5/03")));
		}
		
		[Test]
		public void DateAdd_DateInterval_3()
		{
			Assert.AreEqual(DateTime.Parse("12/5/03 00:00:00"),DateAndTime.DateAdd(DateInterval.Day, 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd(DateInterval.DayOfYear, 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd(DateInterval.Hour, 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd(DateInterval.Minute, 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd(DateInterval.Month, 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd(DateInterval.Quarter, 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd(DateInterval.Second, 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd(DateInterval.Weekday, 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd(DateInterval.WeekOfYear, 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd(DateInterval.Year, 0, DateTime.Parse("12/5/03")));
		}

		[Test]
		public void DateAdd_String_3()
		{
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd("d", 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd("y", 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd("h", 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd("n", 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd("m", 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd("q", 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd("s", 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd("w", 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd("ww", 0, DateTime.Parse("12/5/03")));
			Assert.AreEqual(DateTime.Parse("12/5/2003 00:00:00"),DateAndTime.DateAdd("yyyy", 0, DateTime.Parse("12/5/03")));
		}

		[Test]
		[ExpectedException(typeof(InvalidCastException))]
		public void DateAdd_1()
		{
			// Argument 'DateValue' cannot be converted to type 'Date'.
			DateAndTime.DateAdd("d", 0, "12test5/03");
		}

		[Test]
		[ExpectedException(typeof(OverflowException))]
		public void DateAdd_2()
		{
			DateAndTime.DateAdd("yyyy", 9999999999999999999L, DateTime.Parse("12/5/03"));
		}

		[Test]
		[ExpectedException(typeof(ArgumentOutOfRangeException))]
		public void DateAdd_3()
		{
			DateAndTime.DateAdd("yyyy", -5, new DateTime());
		}

		[Test]
		[ExpectedException(typeof(ArgumentException))]
		public void DateAdd_5()
		{
			DateAndTime.DateAdd("yyy", 5, DateTime.Parse("12/5/03"));
		}

		#endregion

		#region DateDiff Tests

		[Test]
		public void DateDiff () 
		{
			DateTime dtNow = DateTime.Now;
			DateTime dtOld = dtNow.AddYears(-1);

			// TODO: Test this better
			long diff = DateAndTime.DateDiff(DateInterval.Year, dtOld, dtNow, FirstDayOfWeek.System, FirstWeekOfYear.System);

			Assert.AreEqual(dtNow, dtOld.AddYears((int)diff),"#DD01");

			DateTime dtJan1 = new DateTime(2002, 1, 1);
			DateTime dtDec31 = new DateTime(2001, 12, 31);

			diff = DateAndTime.DateDiff(DateInterval.Year, dtDec31, dtJan1, FirstDayOfWeek.System, FirstWeekOfYear.System);

			Assert.AreEqual(1L, diff,"#DD02");

			diff = DateAndTime.DateDiff(DateInterval.Quarter, dtDec31, dtJan1, FirstDayOfWeek.System, FirstWeekOfYear.System);

			Assert.AreEqual(1L, diff,"#DD03");

			diff = DateAndTime.DateDiff(DateInterval.Month, dtDec31, dtJan1, FirstDayOfWeek.System, FirstWeekOfYear.System);

			Assert.AreEqual(1L, diff,"#DD04");

			DateTime dtJan4 = new DateTime(2001, 1, 4);	// This is a Thursday
			DateTime dtJan9 = new DateTime(2001, 1, 9);	// This is the next Tuesday
			
			
			long WD = DateAndTime.DateDiff(DateInterval.Weekday, dtJan4, dtJan9, FirstDayOfWeek.System, FirstWeekOfYear.System);

			Assert.AreEqual (0L, WD,"#DD05");

			long WY = DateAndTime.DateDiff(DateInterval.WeekOfYear, dtJan4, dtJan9, FirstDayOfWeek.System, FirstWeekOfYear.System);

			Assert.AreEqual (1L, WY, "#DD06");
		}

		[Test]
		public void DateDiff_DateInterval_1()
		{
			Assert.AreEqual(727,DateAndTime.DateDiff(DateInterval.Day, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
			Assert.AreEqual(727,DateAndTime.DateDiff(DateInterval.DayOfYear, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
			Assert.AreEqual(17448,DateAndTime.DateDiff(DateInterval.Hour, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
			Assert.AreEqual(1046880,DateAndTime.DateDiff(DateInterval.Minute, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
			Assert.AreEqual(24,DateAndTime.DateDiff(DateInterval.Month, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
			Assert.AreEqual(8,DateAndTime.DateDiff(DateInterval.Quarter, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
			Assert.AreEqual(62812800,DateAndTime.DateDiff(DateInterval.Second, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
			Assert.AreEqual(103,DateAndTime.DateDiff(DateInterval.Weekday, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));			
			Assert.AreEqual(2,DateAndTime.DateDiff(DateInterval.Year, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
		}

		[Test]
		public void DateDiff_String_1()
		{
			Assert.AreEqual(727,DateAndTime.DateDiff("d", DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
			Assert.AreEqual(727,DateAndTime.DateDiff("y", DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
			Assert.AreEqual(17448,DateAndTime.DateDiff("h", DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
			Assert.AreEqual(1046880,DateAndTime.DateDiff("n", DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
			Assert.AreEqual(24,DateAndTime.DateDiff("m", DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
			Assert.AreEqual(8,DateAndTime.DateDiff("q", DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
			Assert.AreEqual(62812800,DateAndTime.DateDiff("s", DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
			Assert.AreEqual(103,DateAndTime.DateDiff("w", DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));			
			Assert.AreEqual(2,DateAndTime.DateDiff("yyyy", DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.System ,FirstWeekOfYear.System));
		}

		[Test]
		public void DateDiff_FirstDayOfWeek_1()
		{
			Assert.AreEqual(727,DateAndTime.DateDiff(DateInterval.Day, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Sunday  ,FirstWeekOfYear.System));
			Assert.AreEqual(727,DateAndTime.DateDiff(DateInterval.DayOfYear, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Sunday  ,FirstWeekOfYear.System));
			Assert.AreEqual(17448,DateAndTime.DateDiff(DateInterval.Hour, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Sunday  ,FirstWeekOfYear.System));
			Assert.AreEqual(1046880,DateAndTime.DateDiff(DateInterval.Minute, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Sunday  ,FirstWeekOfYear.System));
			Assert.AreEqual(24,DateAndTime.DateDiff(DateInterval.Month, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Sunday  ,FirstWeekOfYear.System));
			Assert.AreEqual(8,DateAndTime.DateDiff(DateInterval.Quarter, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Sunday  ,FirstWeekOfYear.System));
			Assert.AreEqual(62812800,DateAndTime.DateDiff(DateInterval.Second, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Sunday  ,FirstWeekOfYear.System));
			Assert.AreEqual(103,DateAndTime.DateDiff(DateInterval.Weekday, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Sunday  ,FirstWeekOfYear.System));			
			Assert.AreEqual(2,DateAndTime.DateDiff(DateInterval.Year, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Sunday  ,FirstWeekOfYear.System));

			Assert.AreEqual(727,DateAndTime.DateDiff(DateInterval.Day, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Monday   ,FirstWeekOfYear.System));
			Assert.AreEqual(727,DateAndTime.DateDiff(DateInterval.DayOfYear, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Monday   ,FirstWeekOfYear.System));
			Assert.AreEqual(17448,DateAndTime.DateDiff(DateInterval.Hour, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Monday   ,FirstWeekOfYear.System));
			Assert.AreEqual(1046880,DateAndTime.DateDiff(DateInterval.Minute, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Monday   ,FirstWeekOfYear.System));
			Assert.AreEqual(24,DateAndTime.DateDiff(DateInterval.Month, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Monday   ,FirstWeekOfYear.System));
			Assert.AreEqual(8,DateAndTime.DateDiff(DateInterval.Quarter, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Monday   ,FirstWeekOfYear.System));
			Assert.AreEqual(62812800,DateAndTime.DateDiff(DateInterval.Second, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Monday   ,FirstWeekOfYear.System));
			Assert.AreEqual(103,DateAndTime.DateDiff(DateInterval.Weekday, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Monday   ,FirstWeekOfYear.System));			
			Assert.AreEqual(2,DateAndTime.DateDiff(DateInterval.Year, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Monday   ,FirstWeekOfYear.System));

			Assert.AreEqual(727,DateAndTime.DateDiff(DateInterval.Day, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Tuesday    ,FirstWeekOfYear.System));
			Assert.AreEqual(727,DateAndTime.DateDiff(DateInterval.DayOfYear, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Tuesday    ,FirstWeekOfYear.System));
			Assert.AreEqual(17448,DateAndTime.DateDiff(DateInterval.Hour, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Tuesday    ,FirstWeekOfYear.System));
			Assert.AreEqual(1046880,DateAndTime.DateDiff(DateInterval.Minute, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Tuesday    ,FirstWeekOfYear.System));
			Assert.AreEqual(24,DateAndTime.DateDiff(DateInterval.Month, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Tuesday    ,FirstWeekOfYear.System));
			Assert.AreEqual(8,DateAndTime.DateDiff(DateInterval.Quarter, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Tuesday    ,FirstWeekOfYear.System));
			Assert.AreEqual(62812800,DateAndTime.DateDiff(DateInterval.Second, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Tuesday    ,FirstWeekOfYear.System));
			Assert.AreEqual(103,DateAndTime.DateDiff(DateInterval.Weekday, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Tuesday    ,FirstWeekOfYear.System));			
			Assert.AreEqual(2,DateAndTime.DateDiff(DateInterval.Year, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Tuesday    ,FirstWeekOfYear.System));

			Assert.AreEqual(727,DateAndTime.DateDiff(DateInterval.Day, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Wednesday     ,FirstWeekOfYear.System));
			Assert.AreEqual(727,DateAndTime.DateDiff(DateInterval.DayOfYear, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Wednesday     ,FirstWeekOfYear.System));
			Assert.AreEqual(17448,DateAndTime.DateDiff(DateInterval.Hour, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Wednesday     ,FirstWeekOfYear.System));
			Assert.AreEqual(1046880,DateAndTime.DateDiff(DateInterval.Minute, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Wednesday     ,FirstWeekOfYear.System));
			Assert.AreEqual(24,DateAndTime.DateDiff(DateInterval.Month, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Wednesday     ,FirstWeekOfYear.System));
			Assert.AreEqual(8,DateAndTime.DateDiff(DateInterval.Quarter, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Wednesday     ,FirstWeekOfYear.System));
			Assert.AreEqual(62812800,DateAndTime.DateDiff(DateInterval.Second, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Wednesday     ,FirstWeekOfYear.System));
			Assert.AreEqual(103,DateAndTime.DateDiff(DateInterval.Weekday, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Wednesday     ,FirstWeekOfYear.System));			
			Assert.AreEqual(2,DateAndTime.DateDiff(DateInterval.Year, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Wednesday     ,FirstWeekOfYear.System));

			Assert.AreEqual(727,DateAndTime.DateDiff(DateInterval.Day, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Thursday   ,FirstWeekOfYear.System));
			Assert.AreEqual(727,DateAndTime.DateDiff(DateInterval.DayOfYear, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Thursday   ,FirstWeekOfYear.System));
			Assert.AreEqual(17448,DateAndTime.DateDiff(DateInterval.Hour, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Thursday   ,FirstWeekOfYear.System));
			Assert.AreEqual(1046880,DateAndTime.DateDiff(DateInterval.Minute, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Thursday   ,FirstWeekOfYear.System));
			Assert.AreEqual(24,DateAndTime.DateDiff(DateInterval.Month, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Thursday   ,FirstWeekOfYear.System));
			Assert.AreEqual(8,DateAndTime.DateDiff(DateInterval.Quarter, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Thursday   ,FirstWeekOfYear.System));
			Assert.AreEqual(62812800,DateAndTime.DateDiff(DateInterval.Second, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Thursday   ,FirstWeekOfYear.System));
			Assert.AreEqual(103,DateAndTime.DateDiff(DateInterval.Weekday, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Thursday   ,FirstWeekOfYear.System));			
			Assert.AreEqual(2,DateAndTime.DateDiff(DateInterval.Year, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Thursday   ,FirstWeekOfYear.System));

			Assert.AreEqual(727,DateAndTime.DateDiff(DateInterval.Day, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Friday    ,FirstWeekOfYear.System));
			Assert.AreEqual(727,DateAndTime.DateDiff(DateInterval.DayOfYear, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Friday    ,FirstWeekOfYear.System));
			Assert.AreEqual(17448,DateAndTime.DateDiff(DateInterval.Hour, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Friday    ,FirstWeekOfYear.System));
			Assert.AreEqual(1046880,DateAndTime.DateDiff(DateInterval.Minute, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Friday    ,FirstWeekOfYear.System));
			Assert.AreEqual(24,DateAndTime.DateDiff(DateInterval.Month, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Friday    ,FirstWeekOfYear.System));
			Assert.AreEqual(8,DateAndTime.DateDiff(DateInterval.Quarter, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Friday    ,FirstWeekOfYear.System));
			Assert.AreEqual(62812800,DateAndTime.DateDiff(DateInterval.Second, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Friday    ,FirstWeekOfYear.System));
			Assert.AreEqual(103,DateAndTime.DateDiff(DateInterval.Weekday, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Friday    ,FirstWeekOfYear.System));			
			Assert.AreEqual(2,DateAndTime.DateDiff(DateInterval.Year, DateTime.Parse("12/5/03"),DateTime.Parse("12/1/05"),FirstDayOfWeek.Friday    ,FirstWeekOfYear.System));