Articolo
11/18/2011

HijriCalendar Class

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Represents the Hijri calendar.

Inheritance Hierarchy

System.Object
System.Globalization.Calendar
System.Globalization.HijriCalendar

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

Syntax

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

[ComVisibleAttribute(true)]
public class HijriCalendar : Calendar

The HijriCalendar type exposes the following members.

Constructors

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

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Properties

	Name	Description
	Eras	Gets the list of eras in the HijriCalendar. (Overrides Calendar.Eras.)
	HijriAdjustment	Gets or sets the number of days to add or subtract from the calendar to accommodate the variances in the start and the end of Ramadan and to accommodate the date difference between countries/regions.
	IsReadOnly	Gets a value indicating whether this Calendar object is read-only. (Inherited from Calendar.)
	MaxSupportedDateTime	Gets the latest date and time supported by this calendar. (Overrides Calendar.MaxSupportedDateTime.)
	MinSupportedDateTime	Gets the earliest date and time supported by this calendar. (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 of the specified year and 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 and 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 and 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. (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 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 and 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, time, and era. (Overrides Calendar.ToDateTime(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32).)
	ToFourDigitYear	Converts the specified year to a four-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 Hijri calendar recognizes one era: A.H. (Latin "Anno Hegirae", which means "the year of the migration," in reference to the migration of Muhammad from Mecca).

In every 30-year cycle that ends with a year that is evenly divisible by 30, the 2nd, 5th, 7th, 10th, 13th, 16th, 18th, 21st, 24th, 26th, and 29th years are leap years. A common year has 354 days and a leap year has 355 days.

The Hijri calendar has 12 months with 29 to 30 days each:

GetMonth value	Month	Days in common years	Days in leap years
1	محرم (Muharram)	30	30
2	صفر (Safar)	29	29
3	‏ربيع الاول (Rabi I)	30	30
4	‏ربيع الثاني (Rabi II)	29	29
5	جمادى الاولى (Jumada I)	30	30
6	جمادى الثانية (Jumada II)	29	29
7	رجب (Rajab)	30	30
8	شعبان (Shaban)	29	29
9	رمضان (Ramadan)	30	30
10	شوال (Shawwal)	29	29
11	ذو القعدة (Zulkadah)	30	30
12	ذو الحجة (Zulhijjah)	29	30

Ramadan, the month of fasting in the Muslim world, officially starts and ends according to a decree that is based on the observation of the new moon. Therefore, the number of days in Shaban and the number of days in Ramadan vary.

The date January 1, 2001 A.D. in the Gregorian calendar is roughly equivalent to the sixth day of Shawwal in the year 1421 A.H. in the Hijri calendar.

This implementation of the HijriCalendar class adjusts the calendar date by adding or subtracting a value from zero to two days to accommodate the variances in the start and the end of Ramadan and to accommodate the date difference between countries/regions. That value is stored in the HijriAdjustment property.

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 ar-LB culture to the Hijri calendar.

' Change the calendar used by a ar-LB CultureInfo object from Gregorian to Hijri. 
Dim lebaneseCulture As New CultureInfo("ar-LB")
Dim originalCalendar As Calendar = lebaneseCulture.Calendar
Dim message As String = Nothing

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

// Change the calendar used by a ar-LB CultureInfo object from Gregorian to Hijri. 
CultureInfo lebaneseCulture = new CultureInfo("ar-LB");
Calendar originalCalendar = lebaneseCulture.Calendar;
string message = null;

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

Platform Notes

Silverlight for Windows Phone

This type is present but is not currently 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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