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Calendar.ToFourDigitYear Method

Converts the specified two-digit 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 virtual int ToFourDigitYear (
	int year
public int ToFourDigitYear (
	int year
public function ToFourDigitYear (
	year : int
) : int



A two-digit integer that represents the year to convert.

Return Value

An integer that contains the four-digit representation of year.

Exception typeCondition


year is outside the range supported by the calendar.

TwoDigitYearMax is the last year in the 100-year range that can be represented by a two-digit year. The century is determined by finding the sole occurrence of the two-digit year within that 100-year range. For example, if TwoDigitYearMax is set to 2029, the 100-year range is from 1930 to 2029; therefore, a 2-digit value of 30 is interpreted as 1930, while a 2-digit value of 29 is interpreted as 2029.

If year is greater than or equal to 100, the value of year is returned unchanged.

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0