Calendar.ToFourDigitYear(Int32) Method


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

 virtual int ToFourDigitYear(int year);
public virtual int ToFourDigitYear (int year);
abstract member ToFourDigitYear : int -> int
override this.ToFourDigitYear : int -> int
Public Overridable Function ToFourDigitYear (year As Integer) As Integer



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


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


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.

ToFourDigitYear supports either a two-digit year or a four-digit year. Passing a two-digit year value (less than 100) causes the method to convert the value to a four-digit value according to the TwoDigitYearMax value representing the appropriate century. If the application supplies a four-digit year value that is within the supported calendar range to ToFourDigitYear, the method returns the actual input value. If the application supplies a four-digit value that is outside the supported calendar range, or if it supplies a negative value, the method throws an exception.

Applies to

See also