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GregorianCalendar Class

Represents the Gregorian calendar.

System.Object
  System.Globalization.Calendar
    System.Globalization.GregorianCalendar

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

[ComVisibleAttribute(true)]
public class GregorianCalendar : Calendar

The GregorianCalendar type exposes the following members.

  NameDescription
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GregorianCalendar()Initializes a new instance of the GregorianCalendar class using the default GregorianCalendarTypes value.
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GregorianCalendar(GregorianCalendarTypes)Initializes a new instance of the GregorianCalendar class using the specified GregorianCalendarTypes value.
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  NameDescription
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360CalendarTypeGets or sets the GregorianCalendarTypes value that denotes the language version of the current GregorianCalendar.
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360ErasGets the list of eras in the GregorianCalendar. (Overrides Calendar.Eras.)
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360IsReadOnlyGets a value indicating whether this Calendar object is read-only. (Inherited from Calendar.)
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360MaxSupportedDateTimeGets the latest date and time supported by the GregorianCalendar type. (Overrides Calendar.MaxSupportedDateTime.)
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360MinSupportedDateTimeGets the earliest date and time supported by the GregorianCalendar type. (Overrides Calendar.MinSupportedDateTime.)
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360TwoDigitYearMaxGets 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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  NameDescription
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360AddDaysReturns a DateTime that is the specified number of days away from the specified DateTime. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360AddHoursReturns a DateTime that is the specified number of hours away from the specified DateTime. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360AddMillisecondsReturns a DateTime that is the specified number of milliseconds away from the specified DateTime. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360AddMinutesReturns a DateTime that is the specified number of minutes away from the specified DateTime. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360AddMonthsReturns a DateTime that is the specified number of months away from the specified DateTime. (Overrides Calendar.AddMonths(DateTime, Int32).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360AddSecondsReturns a DateTime that is the specified number of seconds away from the specified DateTime. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360AddWeeksReturns a DateTime that is the specified number of weeks away from the specified DateTime. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360AddYearsReturns a DateTime that is the specified number of years away from the specified DateTime. (Overrides Calendar.AddYears(DateTime, Int32).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360Equals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodSupported by Silverlight for Windows PhoneSupported by Xbox 360FinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetDayOfMonthReturns the day of the month in the specified DateTime. (Overrides Calendar.GetDayOfMonth(DateTime).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetDayOfWeekReturns the day of the week in the specified DateTime. (Overrides Calendar.GetDayOfWeek(DateTime).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetDayOfYearReturns the day of the year in the specified DateTime. (Overrides Calendar.GetDayOfYear(DateTime).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetDaysInMonth(Int32, Int32)Returns the number of days in the specified month and year of the current era. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetDaysInMonth(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).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetDaysInYear(Int32)Returns the number of days in the specified year of the current era. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetDaysInYear(Int32, Int32)Returns the number of days in the specified year in the specified era. (Overrides Calendar.GetDaysInYear(Int32, Int32).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetEraReturns the era of a specified DateTime value. (Overrides Calendar.GetEra(DateTime).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetHourReturns the hours value in the specified DateTime. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetLeapMonthCalculates the leap month for a specified year and era. (Overrides Calendar.GetLeapMonth(Int32, Int32).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetMillisecondsReturns the milliseconds value in the specified DateTime. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetMinuteReturns the minutes value in the specified DateTime. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetMonthReturns the month in the specified DateTime. (Overrides Calendar.GetMonth(DateTime).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetMonthsInYear(Int32)Returns the number of months in the specified year in the current era. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetMonthsInYear(Int32, Int32)Returns the number of months in the specified year in the specified era. (Overrides Calendar.GetMonthsInYear(Int32, Int32).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetSecondReturns the seconds value in the specified DateTime. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetWeekOfYearReturns the week of the year that includes the date in the specified DateTime value. (Inherited from Calendar.)

In Silverlight for Windows Phone, this member is overridden by GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek).


In XNA Framework, this member is overridden by GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek).
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetYearReturns the year in the specified DateTime. (Overrides Calendar.GetYear(DateTime).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360IsLeapDay(Int32, Int32, Int32)Determines whether the specified date in the current era is a leap day. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360IsLeapDay(Int32, Int32, Int32, Int32)Determines whether the specified date in the specified era is a leap day. (Overrides Calendar.IsLeapDay(Int32, Int32, Int32, Int32).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360IsLeapMonth(Int32, Int32)Determines whether the specified month in the specified year in the current era is a leap month. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360IsLeapMonth(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).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360IsLeapYear(Int32)Determines whether the specified year in the current era is a leap year. (Inherited from Calendar.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360IsLeapYear(Int32, Int32)Determines whether the specified year in the specified era is a leap year. (Overrides Calendar.IsLeapYear(Int32, Int32).)
Protected methodSupported by Silverlight for Windows PhoneSupported by Xbox 360MemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360ToDateTime(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.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360ToDateTime(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).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360ToFourDigitYearConverts the specified year to a four-digit year by using the TwoDigitYearMax property to determine the appropriate century. (Overrides Calendar.ToFourDigitYear(Int32).)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360ToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Public fieldStatic memberSupported by Silverlight for Windows PhoneSupported by Xbox 360ADEraRepresents the current era. This field is constant.
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The Gregorian calendar recognizes two eras: B.C. or B.C.E., and A.D. or C.E. This implementation of the GregorianCalendar class recognizes only the current era (A.D. or C.E.).

A leap year in the Gregorian calendar is defined as a year that is evenly divisible by four, except if it is divisible by 100. However, years that are divisible by 400 are leap years. For example, the year 1900 was not a leap year, but the year 2000 was. A common year has 365 days and a leap year has 366 days.

The Gregorian calendar has 12 months with 28 to 31 days each: January (31 days), February (28 or 29 days), March (31 days), April (30 days), May (31 days), June (30 days), July (31 days), August (31 days), September (30 days), October (31 days), November (30 days), and December (31 days). February has 29 days during leap years and 28 during common years.

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 DateTimeFormatInfo.Calendar property 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 th-TH culture to the Gregorian calendar.


// Change the calendar used by a th-TH CultureInfo object from ThaiBuddhist to Gregorian. 
CultureInfo thaiCulture = new CultureInfo("th-TH");
Calendar originalCalendar = thaiCulture.Calendar;
string message = null;

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


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

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

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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