GregorianCalendar Class
Represents the Gregorian calendar.
Assembly: mscorlib (in mscorlib.dll)
| Name | Description | |
|---|---|---|
![]() | GregorianCalendar() | Initializes a new instance of the GregorianCalendar class using the default GregorianCalendarTypes value. |
![]() | GregorianCalendar(GregorianCalendarTypes) | Initializes a new instance of the GregorianCalendar class using the specified GregorianCalendarTypes value. |
| Name | Description | |
|---|---|---|
![]() | AlgorithmType | Gets a value that indicates whether the current calendar is solar-based, lunar-based, or a combination of both.(Overrides Calendar::AlgorithmType.) |
![]() | CalendarType | Gets or sets the GregorianCalendarTypes value that denotes the language version of the current GregorianCalendar. |
![]() | DaysInYearBeforeMinSupportedYear | Gets the number of days in the year that precedes the year that is specified by the MinSupportedDateTime property.(Inherited from Calendar.) |
![]() | Eras | Gets the list of eras in the GregorianCalendar.(Overrides Calendar::Eras.) |
![]() | IsReadOnly | |
![]() | MaxSupportedDateTime | Gets the latest date and time supported by the GregorianCalendar type.(Overrides Calendar::MaxSupportedDateTime.) |
![]() | MinSupportedDateTime | Gets the earliest date and time supported by the GregorianCalendar 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.) |
| Name | Description | |
|---|---|---|
![]() | AddDays(DateTime, Int32) | |
![]() | AddHours(DateTime, Int32) | |
![]() | AddMilliseconds(DateTime, Double) | |
![]() | AddMinutes(DateTime, Int32) | |
![]() | AddMonths(DateTime, Int32) | Returns a DateTime that is the specified number of months away from the specified DateTime.(Overrides Calendar::AddMonths(DateTime, Int32).) |
![]() | AddSeconds(DateTime, Int32) | |
![]() | AddWeeks(DateTime, Int32) | |
![]() | AddYears(DateTime, Int32) | Returns a DateTime that is the specified number of years away from the specified DateTime.(Overrides Calendar::AddYears(DateTime, Int32).) |
![]() | Clone() | |
![]() | 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 it is reclaimed by garbage collection.(Inherited from Object.) |
![]() | GetDayOfMonth(DateTime) | Returns the day of the month in the specified DateTime.(Overrides Calendar::GetDayOfMonth(DateTime).) |
![]() | GetDayOfWeek(DateTime) | Returns the day of the week in the specified DateTime.(Overrides Calendar::GetDayOfWeek(DateTime).) |
![]() | GetDayOfYear(DateTime) | 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(DateTime) | Returns the era in the specified DateTime.(Overrides Calendar::GetEra(DateTime).) |
![]() | GetHashCode() | Serves as the default hash function. (Inherited from Object.) |
![]() | GetHour(DateTime) | |
![]() | GetLeapMonth(Int32) | Calculates the leap month for a specified year.(Inherited from Calendar.) |
![]() | GetLeapMonth(Int32, Int32) | Calculates the leap month for a specified year and era.(Overrides Calendar::GetLeapMonth(Int32, Int32).) |
![]() | GetMilliseconds(DateTime) | |
![]() | GetMinute(DateTime) | |
![]() | GetMonth(DateTime) | 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(DateTime) | |
![]() | GetType() | |
![]() | GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek) | |
![]() | GetYear(DateTime) | 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 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() | |
![]() | ToDateTime(Int32, Int32, Int32, Int32, Int32, Int32, Int32) | |
![]() | 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(Int32) | 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.) |
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.).
Note |
|---|
For information about using the GregorianCalendar class and the other calendar classes in the .NET Framework, see Working with Calendars. |
A leap year in the Gregorian calendar is defined as a year that is evenly divisible by 4, unless 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.
Important |
|---|
By default, all DateTime and DateTimeOffset values express dates and times in the Gregorian calendar. |
The Gregorian calendar was developed as a replacement for the Julian calendar (which is represented by the JulianCalendar class) and was first introduced in a small number of cultures on October 15, 1582. When working with historic dates that precede a culture's adoption of the Gregorian calendar, you should use the original calendar if it is available in the .NET Framework. For example, Denmark changed from the Julian calendar to the Gregorian calendar on February 19 (in the Julian calendar) or March 1 (in the Gregorian calendar) of 1700. In this case, for dates before the adoption of the Gregorian calendar, you should use the Julian calendar. However, note that no culture offers intrinsic support for the JulianCalendar class. You must use the JulianCalendar class as a standalone calendar. For more information, see .
The following example illustrates that February 18, 1700 in the Julian calendar, which is the last day the Julian calendar was officially used in Denmark, is one day earlier than March 1, 1700 in the Gregorian calendar.
Each CultureInfo supports a set of calendars. The Calendar property returns the default calendar for the culture, and the OptionalCalendars property returns an array containing all the calendars supported by the culture. To change the calendar used by a CultureInfo, the application can set the Calendar property to a new Calendar.
GetEra ignores punctuation in abbreviated era names, only if the GregorianCalendar is selected in DateTimeFormatInfo::Calendar and the culture uses "A.D." as the era name, that is, "A.D." is equivalent to "AD".
The following code example shows that DateTimeFormatInfo ignores the punctuation in the era name, only if the calendar is Gregorian and the culture uses the era name "A.D.".
using namespace System; using namespace System::Globalization; using namespace System::Collections; int main() { // Creates strings with punctuation and without. String^ strADPunc = "A.D."; String^ strADNoPunc = "AD"; String^ strCEPunc = "C.E."; String^ strCENoPunc = "CE"; // Calls DTFI::GetEra for each culture that uses GregorianCalendar as the default calendar. Console::WriteLine( " ----- AD ----- ----- CE -----" ); Console::WriteLine( "CULTURE PUNC NO PUNC PUNC NO PUNC CALENDAR" ); IEnumerator^ en = CultureInfo::GetCultures( CultureTypes::SpecificCultures )->GetEnumerator(); while ( en->MoveNext() ) { CultureInfo^ myCI = safe_cast<CultureInfo^>(en->Current); Console::Write( "{0, -12}", myCI ); Console::Write( "{0,-7}{1,-9}", myCI->DateTimeFormat->GetEra( strADPunc ), myCI->DateTimeFormat->GetEra( strADNoPunc ) ); Console::Write( "{0, -7}{1, -9}", myCI->DateTimeFormat->GetEra( strCEPunc ), myCI->DateTimeFormat->GetEra( strCENoPunc ) ); Console::Write( "{0}", myCI->Calendar ); Console::WriteLine(); } } /* This code produces the following output. This output has been cropped for brevity. ----- AD ----- ----- CE ----- CULTURE PUNC NO PUNC PUNC NO PUNC CALENDAR ar-SA -1 -1 -1 -1 System.Globalization.HijriCalendar ar-IQ 1 1 -1 -1 System.Globalization.GregorianCalendar ar-EG 1 1 -1 -1 System.Globalization.GregorianCalendar ar-LY 1 1 -1 -1 System.Globalization.GregorianCalendar ar-DZ 1 1 -1 -1 System.Globalization.GregorianCalendar ar-MA 1 1 -1 -1 System.Globalization.GregorianCalendar ar-TN 1 1 -1 -1 System.Globalization.GregorianCalendar ar-OM 1 1 -1 -1 System.Globalization.GregorianCalendar ar-YE 1 1 -1 -1 System.Globalization.GregorianCalendar ar-SY 1 1 -1 -1 System.Globalization.GregorianCalendar ar-JO 1 1 -1 -1 System.Globalization.GregorianCalendar ar-LB 1 1 -1 -1 System.Globalization.GregorianCalendar ar-KW 1 1 -1 -1 System.Globalization.GregorianCalendar ar-AE 1 1 -1 -1 System.Globalization.GregorianCalendar ar-BH 1 1 -1 -1 System.Globalization.GregorianCalendar ar-QA 1 1 -1 -1 System.Globalization.GregorianCalendar bg-BG 1 1 -1 -1 System.Globalization.GregorianCalendar ca-ES -1 -1 -1 -1 System.Globalization.GregorianCalendar zh-TW -1 -1 -1 -1 System.Globalization.GregorianCalendar zh-CN -1 -1 -1 -1 System.Globalization.GregorianCalendar zh-HK 1 1 -1 -1 System.Globalization.GregorianCalendar zh-SG 1 1 -1 -1 System.Globalization.GregorianCalendar zh-MO 1 1 -1 -1 System.Globalization.GregorianCalendar cs-CZ -1 -1 -1 -1 System.Globalization.GregorianCalendar da-DK 1 1 -1 -1 System.Globalization.GregorianCalendar */
Available since 10
.NET Framework
Available since 1.1
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.







