This property allows a 2-digit year to be properly translated to a 4-digit year. For example, in the Gregorian calendar, if this property 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.

The initial value of this property is derived from the settings in the regional and language options portion of Control Panel. However, that information can change during the life of the AppDomain. The System.Globalization.EastAsianLunisolarCalendar class does not detect changes in the system settings automatically.