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11/17/2011

HebrewCalendar Class

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Represents the Hebrew calendar.

Inheritance Hierarchy

System.Object
System.Globalization.Calendar
System.Globalization.HebrewCalendar

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

Syntax

'Declaration
<ComVisibleAttribute(True)> _
Public Class HebrewCalendar _
    Inherits Calendar

[ComVisibleAttribute(true)]
public class HebrewCalendar : Calendar

The HebrewCalendar type exposes the following members.

Constructors

	Name	Description
	HebrewCalendar	Initializes a new instance of the HebrewCalendar class.

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Properties

	Name	Description
	Eras	Gets the list of eras in the HebrewCalendar. (Overrides Calendar.Eras.)
	IsReadOnly	Gets a value indicating whether this Calendar object is read-only. (Inherited from Calendar.)
	MaxSupportedDateTime	Gets the latest date and time supported by the HebrewCalendar type. (Overrides Calendar.MaxSupportedDateTime.)
	MinSupportedDateTime	Gets the earliest date and time supported by the HebrewCalendar type. (Overrides Calendar.MinSupportedDateTime.)
	TwoDigitYearMax	Gets or sets the last year of a 100-year range that can be represented by a 2-digit year. (Overrides Calendar.TwoDigitYearMax.)

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Methods

	Name	Description
	AddDays	Returns a DateTime that is the specified number of days away from the specified DateTime. (Inherited from Calendar.)
	AddHours	Returns a DateTime that is the specified number of hours away from the specified DateTime. (Inherited from Calendar.)
	AddMilliseconds	Returns a DateTime that is the specified number of milliseconds away from the specified DateTime. (Inherited from Calendar.)
	AddMinutes	Returns a DateTime that is the specified number of minutes away from the specified DateTime. (Inherited from Calendar.)
	AddMonths	Returns a DateTime that is the specified number of months away from the specified DateTime. (Overrides Calendar.AddMonths(DateTime, Int32).)
	AddSeconds	Returns a DateTime that is the specified number of seconds away from the specified DateTime. (Inherited from Calendar.)
	AddWeeks	Returns a DateTime that is the specified number of weeks away from the specified DateTime. (Inherited from Calendar.)
	AddYears	Returns a DateTime that is the specified number of years away from the specified DateTime. (Overrides Calendar.AddYears(DateTime, Int32).)
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetDayOfMonth	Returns the day of the month in the specified DateTime. (Overrides Calendar.GetDayOfMonth(DateTime).)
	GetDayOfWeek	Returns the day of the week in the specified DateTime. (Overrides Calendar.GetDayOfWeek(DateTime).)
	GetDayOfYear	Returns the day of the year in the specified DateTime. (Overrides Calendar.GetDayOfYear(DateTime).)
	GetDaysInMonth(Int32, Int32)	Returns the number of days in the specified month and year of the current era. (Inherited from Calendar.)
	GetDaysInMonth(Int32, Int32, Int32)	Returns the number of days in the specified month in the specified year in the specified era. (Overrides Calendar.GetDaysInMonth(Int32, Int32, Int32).)
	GetDaysInYear(Int32)	Returns the number of days in the specified year of the current era. (Inherited from Calendar.)
	GetDaysInYear(Int32, Int32)	Returns the number of days in the specified year in the specified era. (Overrides Calendar.GetDaysInYear(Int32, Int32).)
	GetEra	Returns the era of a specified DateTime value. (Overrides Calendar.GetEra(DateTime).)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetHour	Returns the hours value in the specified DateTime. (Inherited from Calendar.)
	GetLeapMonth	Calculates the leap month for a specified year and era. (Overrides Calendar.GetLeapMonth(Int32, Int32).)
	GetMilliseconds	Returns the milliseconds value in the specified DateTime. (Inherited from Calendar.)
	GetMinute	Returns the minutes value in the specified DateTime. (Inherited from Calendar.)
	GetMonth	Returns the month in the specified DateTime. (Overrides Calendar.GetMonth(DateTime).)
	GetMonthsInYear(Int32)	Returns the number of months in the specified year in the current era. (Inherited from Calendar.)
	GetMonthsInYear(Int32, Int32)	Returns the number of months in the specified year in the specified era. (Overrides Calendar.GetMonthsInYear(Int32, Int32).)
	GetSecond	Returns the seconds value in the specified DateTime. (Inherited from Calendar.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetWeekOfYear	Returns the week of the year that includes the date in the specified DateTime value. (Inherited from Calendar.)
	GetYear	Returns the year in the specified DateTime value. (Overrides Calendar.GetYear(DateTime).)
	IsLeapDay(Int32, Int32, Int32)	Determines whether the specified date in the current era is a leap day. (Inherited from Calendar.)
	IsLeapDay(Int32, Int32, Int32, Int32)	Determines whether the specified date in the specified era is a leap day. (Overrides Calendar.IsLeapDay(Int32, Int32, Int32, Int32).)
	IsLeapMonth(Int32, Int32)	Determines whether the specified month in the specified year in the current era is a leap month. (Inherited from Calendar.)
	IsLeapMonth(Int32, Int32, Int32)	Determines whether the specified month in the specified year in the specified era is a leap month. (Overrides Calendar.IsLeapMonth(Int32, Int32, Int32).)
	IsLeapYear(Int32)	Determines whether the specified year in the current era is a leap year. (Inherited from Calendar.)
	IsLeapYear(Int32, Int32)	Determines whether the specified year in the specified era is a leap year. (Overrides Calendar.IsLeapYear(Int32, Int32).)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToDateTime(Int32, Int32, Int32, Int32, Int32, Int32, Int32)	Returns a DateTime that is set to the specified date and time in the current era. (Inherited from Calendar.)
	ToDateTime(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32)	Returns a DateTime that is set to the specified date and time in the specified era. (Overrides Calendar.ToDateTime(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32).)
	ToFourDigitYear	Converts the specified year to a 4-digit year by using the TwoDigitYearMax property to determine the appropriate century. (Overrides Calendar.ToFourDigitYear(Int32).)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

The Hebrew calendar recognizes two eras: B.C.E. (before the common era) and A.M. (Latin "Anno Mundi", which means "the year of the world"). This implementation of the HebrewCalendar class recognizes only the current era (A.M.) and the Hebrew years 5343 to 5999 (1583 to 2239 in the Gregorian calendar).

In every 19-year cycle that ends with a year that is evenly divisible by 19, the 3rd, 6th, 8th, 11th, 14th, 17th, and 19th years are leap years. A common year can have from 353 to 355 days, depending on the placement of Jewish holidays. A leap year can have from 383 to 385 days.

The Hebrew calendar has 12 months during common years and 13 months during leap years:

GetMonth value (common year)	GetMonth value (leap year)	Month	Days in common years	Days in leap years
1	1	תשרי (Tishrei)	30	30
2	2	חשון (Cheshvan)	29/30	29/30
3	3	כסלו (Kislev)	29/30	29/30
4	4	טבת (Tevet)	29	29
5	5	שבט (Shevat)	30	30
6	-	אדר (Adar)	29	-
-	6	אדר א (Adar Alef)	-	30
-	7	אדר ב (Adar Beit)	-	29
7	8	ניסן (Nissan)	30	30
8	9	אייר (Iyar)	29	29
9	10	סיון (Sivan)	30	30
10	11	תמוז (Tamuz)	29	29
11	12	אב (Av)	30	30
12	13	אלול (Elul)	29	29

The days in Cheshvan and Kislev vary depending on the placement of Jewish holidays. During leap years, Adar is replaced by Adar Alef with 30 days and Adar Beit with 29 days. Adar Beit is considered the leap month. The last day of Adar Alef and all the days in Adar Beit are considered leap days.

The date January 1, 2001 A.D. in the Gregorian calendar is equivalent to the sixth day of Tevet in the year 5761 A.M. in the Hebrew calendar.

Each CultureInfo object supports a set of calendars. The CultureInfo.Calendar property returns the default calendar for the culture, and the CultureInfo.OptionalCalendars property returns an array containing all the calendars supported by the culture. To change the calendar used by a CultureInfo object, the application can set the Calendar property of CultureInfo.DateTimeFormat to a new Calendar object if the new calendar is one of the culture's optional calendars. The following example shows how to change the calendar for the he-IL culture to the Hebrew calendar.

' Change the calendar used by a he-IL CultureInfo object from Gregorian to Hebrew. 
Dim hebrewCulture As New CultureInfo("he-IL")
Dim originalCalendar As Calendar = hebrewCulture.Calendar
Dim message As String = Nothing

' Confirm that the default calendar is not the Hebrew calendar.
If originalCalendar.ToString <> "System.Globalization.HebrewCalendar" Then
   ' Check whether the culture supports the Hebrew calendar.
   Dim supported As Boolean = False
   For Each supportedCal As Calendar In hebrewCulture.OptionalCalendars
      If supportedCal.ToString = "System.Globalization.HebrewCalendar" Then
         supported = True            
         hebrewCulture.DateTimeFormat.Calendar = supportedCal
         message = String.Format("Changed the current calendar for the {0} culture from {1} to {2}.", _
                                 hebrewCulture.ToString(), _
                                 originalCalendar.ToString.Replace("System.Globalization.", ""), _
                                 supportedCal.ToString.Replace("System.Globalization.", ""))                                 
         Exit For
      End If
      If Not supported Then message = "The Hebrew calendar is not supported."
   Next        
Else
   message = String.Format("Hebrew is the default calendar for the {0} culture.", _
                           hebrewCulture.ToString())
End If
outputBlock.Text += message + vbCrLf
' The example displays the following output:
'   Changed the current calendar for the he-IL culture from GregorianCalendar to HebrewCalendar.

// Change the calendar used by a he-IL CultureInfo object from Gregorian to Hebrew. 
CultureInfo hebrewCulture = new CultureInfo("he-IL");
Calendar originalCalendar = hebrewCulture.Calendar;
string message = null;

// Confirm that the default calendar is not the Hebrew calendar.
if (originalCalendar.ToString() != "System.Globalization.HebrewCalendar")
{
   // Check whether the culture supports the Hebrew calendar.
   bool supported = false;
   foreach (Calendar supportedCal in hebrewCulture.OptionalCalendars)
   {
      if (supportedCal.ToString() == "System.Globalization.HebrewCalendar")
      {
         supported = true;            
         hebrewCulture.DateTimeFormat.Calendar = supportedCal;
         message = String.Format("Changed the current calendar for the {0} culture from {1} to {2}.",
                                 hebrewCulture.ToString(),
                                 originalCalendar.ToString().Replace("System.Globalization.", ""),
                                 supportedCal.ToString().Replace("System.Globalization.", ""));                                 
         break;
      }
   }
   if (! supported) message = "The Hebrew calendar is not supported.";
}       
else
{
   message = String.Format("Hebrew is the default calendar for the {0} culture.",
                           hebrewCulture.ToString());
}
outputBlock.Text += message + "\n";
// The example displays the following output:
//   Changed the current calendar for the he-IL culture from GregorianCalendar to HebrewCalendar.

Platform Notes

Silverlight for Windows Phone

This type is present but is not supported on Windows Phone.

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.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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