JapaneseCalendar Class

July 28, 2014

Represents the Japanese calendar.

System.Object
  System.Globalization.Calendar
    System.Globalization.JapaneseCalendar

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

public class JapaneseCalendar : Calendar

The JapaneseCalendar type exposes the following members.

  NameDescription
Public methodJapaneseCalendarInitializes a new instance of the JapaneseCalendar class.
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  NameDescription
Public propertyErasGets the list of eras in the JapaneseCalendar. (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 JapaneseCalendar class. (Overrides Calendar.MaxSupportedDateTime.)
Public propertyMinSupportedDateTimeGets the earliest date and time supported by the JapaneseCalendar class. (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. (Overrides Calendar.GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek).)
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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The Japanese calendar, which is also known as the Wareki calendar, works exactly like the Gregorian calendar, except that the year and era are different.

The Japanese calendar recognizes one era for every emperor's reign. The current era is the Heisei era, which began in the Gregorian calendar year 1989. The era name is typically displayed before the year. For example, the Gregorian calendar year 2001 is the Japanese calendar year Heisei 13. Note that the first year of an era is called "Gannen." Therefore, the Gregorian calendar year 1989 was the Japanese calendar year Heisei Gannen.

This class assigns numbers to the eras as follows:

GetEra value

Era Name

Era Abbreviation

Gregorian Dates

4

平成 (Heisei)

平 (H, h)

January 8, 1989 to present

3

昭和 (Showa)

昭 (S, s)

December 25, 1926 to January 7, 1989

2

大正 (Taisho)

大 (T, t)

July 30, 1912 to December 24, 1926

1

明治 (Meiji)

明 (M, m)

January 1, 1868 to July 29, 1912

This class handles only dates from the first day of the first month in the year Meiji 1 (January 1, 1868 of the Gregorian calendar). Although the Japanese calendar was switched from a lunar calendar to a solar calendar in the year Meiji 6 (1873 of the Gregorian calendar), this implementation is based on the solar calendar only.

Leap years in the Japanese calendar correspond to the same leap years in the Gregorian calendar. A leap year in the Gregorian calendar is defined as a Gregorian year that is evenly divisible by four, except if it is divisible by 100. However, Gregorian years that are divisible by 400 are leap years. A common year has 365 days and a leap year has 366 days.

The Japanese calendar has 12 months with 28 to 31 days each:

GetMonth value

Month

English

Days in common years

Days in leap years

1

1月 (Ichigatsu)

January

31

31

2

2月 (Nigatsu)

February

28

29

3

3月 (Sangatsu)

March

31

31

4

4月 (Shigatsu)

April

30

30

5

5月 (Gogatsu)

May

31

31

6

6月 (Rokugatsu)

June

30

30

7

7月 (Shichigatsu)

July

31

31

8

8月 (Hachigatsu)

August

31

31

9

9月 (Kugatsu)

September

30

30

10

10月 (Juugatsu)

October

31

31

11

11月 (Juuichigatsu)

November

30

30

12

12月 (Juunigatsu)

December

31

31

Nigatsu, which is equivalent to the Gregorian calendar month of February, has 29 days during leap years and 28 during common years.

The date January 1, 2001 A.D. in the Gregorian calendar is equivalent to the first day of Ichigatsu in the year Heisei 13 in the Japanese calendar.

If the application is using the JapaneseCalendar class, DateTime.Parse recognizes the era abbreviations in front of the year. The abbreviation is either the single-character case-insensitive Latin alphabet abbreviation or the single-character Kanji abbreviation.

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 should 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 ja-JP culture to the Japanese calendar.


// Change the calendar used by a Japanese CultureInfo object from Gregorian to Japanese. 
CultureInfo japanCulture = new CultureInfo("ja-JP");
Calendar originalCalendar = japanCulture.Calendar;
string message = null;

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


Version Notes

Windows Phone

This type is present but is not currently supported in Windows Phone.

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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