HebrewCalendar.AddYears Method

Returns a DateTime that is the specified number of years away from the specified DateTime.

Namespace:  System.Globalization
Assembly:  mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public Overrides Function AddYears ( _
    time As DateTime, _
    years As Integer _
) As DateTime
public override DateTime AddYears(
    DateTime time,
    int years
)

Parameters

Return Value

Type: System.DateTime
The DateTime that results from adding the specified number of years to the specified DateTime.

Exceptions

Exception Condition
ArgumentException

The resulting DateTime is outside the supported range.

Remarks

This implementation of the HebrewCalendar class recognizes only the Hebrew years 5343 to 5999 (1583 to 2239 in the Gregorian calendar).

The day part of the resulting DateTime is affected if the resulting day is not a valid day in the resulting month of the resulting year. It is changed to the last valid day in the resulting month of the resulting year. For example, Cheshvan can have 29 or 30 days, depending on the placement of Jewish holidays. Suppose that Cheshvan has 30 days in the current year and 29 in the following year. If the specified date is the 30th day of Cheshvan in the current year and the value of years is 1, the resulting date will be the 29th day of Cheshvan in the following year.

The month part of the resulting DateTime is affected if the resulting month is not a valid month in the resulting year. It is changed to the last valid month in the resulting year. For example, if the month in the time parameter is the 13th month of a leap year and the value of years is 1, the month in the resulting DateTime is the 12th month of the following year, which is a non-leap year. Note that even when the month part does not change, it might still refer to a different month. For example, Adar Beit is the 7th month in leap years, but Nissan is the 7th month in common years.

This implementation supports only the current era. Therefore, ArgumentException is thrown if the resulting year is outside the era of the specified DateTime.

The time-of-day part of the resulting DateTime remains the same as the specified DateTime.

If years is negative, the resulting DateTime is earlier than the specified DateTime.

The Kind property of the returned DateTime value always equals DateTimeKind.Unspecified. You can preserve the Kind property of the time parameter by calling the DateTime.SpecifyKind method, as the following example shows.

returnTime = DateTime.SpecifyKind(cal.AddYears(time, years), time.Kind)
returnTime = DateTime.SpecifyKind(cal.AddYears(time, years), time.Kind);

Examples

The following code example displays the values of several components of a DateTime in terms of the Hebrew calendar.

Imports System.Globalization

Public Class Example
   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      ' Sets a DateTime to April 3, 2002 of the Gregorian calendar.
      Dim myDT As New DateTime(2002, 4, 3, New GregorianCalendar())

      ' Creates an instance of the HebrewCalendar.
      Dim myCal As New HebrewCalendar()

      ' Displays the values of the DateTime.
      outputBlock.Text += String.Format("April 3, 2002 of the Gregorian calendar equals the following in the Hebrew calendar:") & vbCrLf
      DisplayValues(outputBlock, myCal, myDT)

      ' Adds two years and ten months.
      myDT = myCal.AddYears(myDT, 2)
      myDT = myCal.AddMonths(myDT, 10)

      ' Displays the values of the DateTime.
      outputBlock.Text &= "After adding two years and ten months:" & vbCrLf
      DisplayValues(outputBlock, myCal, myDT)
   End Sub 

   Public Shared Sub DisplayValues(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal myCal As Calendar, ByVal myDT As DateTime)
      outputBlock.Text += String.Format("   Era:        {0}", myCal.GetEra(myDT)) & vbCrLf
      outputBlock.Text += String.Format("   Year:       {0}", myCal.GetYear(myDT)) & vbCrLf
      outputBlock.Text += String.Format("   Month:      {0}", myCal.GetMonth(myDT)) & vbCrLf
      outputBlock.Text += String.Format("   DayOfYear:  {0}", myCal.GetDayOfYear(myDT)) & vbCrLf
      outputBlock.Text += String.Format("   DayOfMonth: {0}", myCal.GetDayOfMonth(myDT)) & vbCrLf
      outputBlock.Text += String.Format("   DayOfWeek:  {0}", myCal.GetDayOfWeek(myDT)) & vbCrLf
      outputBlock.Text &= vbCrLf
   End Sub 
End Class  
' This code produces the following output.
'    April 3, 2002 of the Gregorian calendar equals the following in the Hebrew calendar:
'       Era:        1
'       Year:       5762
'       Month:      7
'       DayOfYear:  198
'       DayOfMonth: 21
'       DayOfWeek:  Wednesday
'    
'    After adding two years and ten months:
'       Era:        1
'       Year:       5765
'       Month:      5
'       DayOfYear:  138
'       DayOfMonth: 21
'       DayOfWeek:  Monday
using System;
using System.Globalization;


public class Example
{

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {

      // Sets a DateTime to April 3, 2002 of the Gregorian calendar.
      DateTime myDT = new DateTime(2002, 4, 3, new GregorianCalendar());

      // Creates an instance of the HebrewCalendar.
      HebrewCalendar myCal = new HebrewCalendar();

      // Displays the values of the DateTime.
      outputBlock.Text += String.Format("April 3, 2002 of the Gregorian calendar equals the following in the Hebrew calendar:") + "\n";
      DisplayValues(outputBlock, myCal, myDT);

      // Adds two years and ten months.
      myDT = myCal.AddYears(myDT, 2);
      myDT = myCal.AddMonths(myDT, 10);

      // Displays the values of the DateTime.
      outputBlock.Text += "After adding two years and ten months:" + "\n";
      DisplayValues(outputBlock, myCal, myDT);

   }

   public static void DisplayValues(System.Windows.Controls.TextBlock outputBlock, Calendar myCal, DateTime myDT)
   {
      outputBlock.Text += String.Format("   Era:        {0}", myCal.GetEra(myDT)) + "\n";
      outputBlock.Text += String.Format("   Year:       {0}", myCal.GetYear(myDT)) + "\n";
      outputBlock.Text += String.Format("   Month:      {0}", myCal.GetMonth(myDT)) + "\n";
      outputBlock.Text += String.Format("   DayOfYear:  {0}", myCal.GetDayOfYear(myDT)) + "\n";
      outputBlock.Text += String.Format("   DayOfMonth: {0}", myCal.GetDayOfMonth(myDT)) + "\n";
      outputBlock.Text += String.Format("   DayOfWeek:  {0}", myCal.GetDayOfWeek(myDT)) + "\n";
      outputBlock.Text += "\n";
   }

}

/*
This code produces the following output.

April 3, 2002 of the Gregorian calendar equals the following in the Hebrew calendar:
   Era:        1
   Year:       5762
   Month:      7
   DayOfYear:  198
   DayOfMonth: 21
   DayOfWeek:  Wednesday

After adding two years and ten months:
   Era:        1
   Year:       5765
   Month:      5
   DayOfYear:  138
   DayOfMonth: 21
   DayOfWeek:  Monday

*/

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.