This method converts the year parameter to a four-digit year representation using the PersianCalendar.TwoDigitYearMax property. The return value is the upper boundary of a 100-year range that allows a two-digit year to be properly translated to a four-digit year. For example, if the 100-year range is from 1930 through 2029, then a two-digit value of 30 is interpreted as 1930 while a two-digit value of 29 is interpreted as 2029.

PersianCalendar.ToFourDigitYear(int) 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 PersianCalendar.TwoDigitYearMax value representing the appropriate century. If the application supplies a four-digit year value that is within the supported calendar range to PersianCalendar.ToFourDigitYear(int), 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.

Namespace: System.Globalization
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 2.0.0.0, 4.0.0.0
Since: .NET 2.0