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JapaneseCalendar Class

Updated: March 2012

Represents the Japanese calendar.

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

[SerializableAttribute]
[ComVisibleAttribute(true)]
public class JapaneseCalendar : Calendar

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)

September 8, 1868 to July 29, 1912

This class handles dates from September 8 in the year Meiji 1 (in the Gregorian calendar, September 8, 1868). 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 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 should set the Calendar property of CultureInfo.DateTimeFormat to a new Calendar.

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

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Date

History

Reason

March 2012

Corrected information about the Meiji era.

Customer feedback.

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