UmAlQuraCalendar.ToFourDigitYear Method

Converts the specified year to a four-digit year by using the TwoDigitYearMax property to determine the appropriate century.

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

public override int ToFourDigitYear(
	int year


Type: System.Int32
A 2-digit year from 0 through 99, or a 4-digit Um Al Qura calendar year from 1318 through 1450.

Return Value

Type: System.Int32
If the year parameter is a 2-digit year, the return value is the corresponding 4-digit year. If the year parameter is a 4-digit year, the return value is the unchanged year parameter.


year is outside the range supported by this calendar.

The ToFourDigitYear method uses the year parameter, the TwoDigitYearMax property, and a year to calculate a 4-digit year. The century is determined by finding the sole occurrence of the 2-digit year parameter within that 100-year range. For example, if TwoDigitYearMax is set to 1429, the 100-year range is from 1330 through 1429. Therefore, a 2-digit value of 30 is interpreted as 1330, while a 2-digit value of 29 is interpreted as 1429.

If the TwoDigitYearMax property is the special value 99, the ToFourDigitYear method ignores the settings in the regional and language options in Control Panel and returns the year parameter unchanged.

The year parameter can be either a two-digit year or a four-digit year. If year is a two-digit year value (less than 100), the method converts year to a four-digit value according to the TwoDigitYearMax value representing the appropriate century. If year is a four-digit year value that is within the supported calendar range, the method returns year unchanged. If year is a four-digit value that is outside the supported calendar range, or if it is a negative value, the method throws an exception.


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.

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