GregorianCalendar Class

GregorianCalendar Class

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Represents the Gregorian calendar.

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

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

public class GregorianCalendar : Calendar

The GregorianCalendar type exposes the following members.

  NameDescription
Public methodGregorianCalendar()Initializes a new instance of the GregorianCalendar class using the default GregorianCalendarTypes value.
Public methodGregorianCalendar(GregorianCalendarTypes)Initializes a new instance of the GregorianCalendar class using the specified GregorianCalendarTypes value.
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  NameDescription
Public propertyCalendarTypeGets or sets the GregorianCalendarTypes value that denotes the language version of the current GregorianCalendar.
Public propertyErasGets the list of eras in the GregorianCalendar. (Overrides Calendar.Eras.)
Public propertyIsReadOnlyGets a value indicating whether this Calendar object is read-only. (Inherited from Calendar.)
Public propertyMaxSupportedDateTimeGets the latest date and time supported by the GregorianCalendar type. (Overrides Calendar.MaxSupportedDateTime.)
Public propertyMinSupportedDateTimeGets the earliest date and time supported by the GregorianCalendar type. (Overrides Calendar.MinSupportedDateTime.)
Public propertyTwoDigitYearMaxGets 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 methodAddDaysReturns a DateTime that is the specified number of days away from the specified DateTime. (Inherited from Calendar.)
Public methodAddHoursReturns a DateTime that is the specified number of hours away from the specified DateTime. (Inherited from Calendar.)
Public methodAddMillisecondsReturns a DateTime that is the specified number of milliseconds away from the specified DateTime. (Inherited from Calendar.)
Public methodAddMinutesReturns a DateTime that is the specified number of minutes away from the specified DateTime. (Inherited from Calendar.)
Public methodAddMonthsReturns a DateTime that is the specified number of months away from the specified DateTime. (Overrides Calendar.AddMonths(DateTime, Int32).)
Public methodAddSecondsReturns a DateTime that is the specified number of seconds away from the specified DateTime. (Inherited from Calendar.)
Public methodAddWeeksReturns a DateTime that is the specified number of weeks away from the specified DateTime. (Inherited from Calendar.)
Public methodAddYearsReturns a DateTime that is the specified number of years away from the specified DateTime. (Overrides Calendar.AddYears(DateTime, Int32).)
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetDayOfMonthReturns the day of the month in the specified DateTime. (Overrides Calendar.GetDayOfMonth(DateTime).)
Public methodGetDayOfWeekReturns the day of the week in the specified DateTime. (Overrides Calendar.GetDayOfWeek(DateTime).)
Public methodGetDayOfYearReturns the day of the year in the specified DateTime. (Overrides Calendar.GetDayOfYear(DateTime).)
Public methodGetDaysInMonth(Int32, Int32)Returns the number of days in the specified month and year of the current era. (Inherited from Calendar.)
Public methodGetDaysInMonth(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 methodGetDaysInYear(Int32)Returns the number of days in the specified year of the current era. (Inherited from Calendar.)
Public methodGetDaysInYear(Int32, Int32)Returns the number of days in the specified year in the specified era. (Overrides Calendar.GetDaysInYear(Int32, Int32).)
Public methodGetEraReturns the era of a specified DateTime value. (Overrides Calendar.GetEra(DateTime).)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetHourReturns the hours value in the specified DateTime. (Inherited from Calendar.)
Public methodGetLeapMonthCalculates the leap month for a specified year and era. (Overrides Calendar.GetLeapMonth(Int32, Int32).)
Public methodGetMillisecondsReturns the milliseconds value in the specified DateTime. (Inherited from Calendar.)
Public methodGetMinuteReturns the minutes value in the specified DateTime. (Inherited from Calendar.)
Public methodGetMonthReturns the month in the specified DateTime. (Overrides Calendar.GetMonth(DateTime).)
Public methodGetMonthsInYear(Int32)Returns the number of months in the specified year in the current era. (Inherited from Calendar.)
Public methodGetMonthsInYear(Int32, Int32)Returns the number of months in the specified year in the specified era. (Overrides Calendar.GetMonthsInYear(Int32, Int32).)
Public methodGetSecondReturns the seconds value in the specified DateTime. (Inherited from Calendar.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetWeekOfYearReturns the week of the year that includes the date in the specified DateTime value. (Inherited from Calendar.)
Public methodGetYearReturns the year in the specified DateTime. (Overrides Calendar.GetYear(DateTime).)
Public methodIsLeapDay(Int32, Int32, Int32)Determines whether the specified date in the current era is a leap day. (Inherited from Calendar.)
Public methodIsLeapDay(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 methodIsLeapMonth(Int32, Int32)Determines whether the specified month in the specified year in the current era is a leap month. (Inherited from Calendar.)
Public methodIsLeapMonth(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 methodIsLeapYear(Int32)Determines whether the specified year in the current era is a leap year. (Inherited from Calendar.)
Public methodIsLeapYear(Int32, Int32)Determines whether the specified year in the specified era is a leap year. (Overrides Calendar.IsLeapYear(Int32, Int32).)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToDateTime(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 methodToDateTime(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 methodToFourDigitYearConverts the specified year to a four-digit year by using the TwoDigitYearMax property to determine the appropriate century. (Overrides Calendar.ToFourDigitYear(Int32).)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Public fieldStatic memberADEraRepresents 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.


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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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