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The HebrewCalendar.TwoDigitYearMax property allows a 2-digit year to be properly translated to a 4-digit year. For example, if this property is set to 5729, the 100-year range is from 5630 to 5729. Therefore, a 2-digit value of 30 is interpreted as 5630, while a 2-digit value of 29 is interpreted as 5729.
The initial value of this property is derived from the settings in the regional and language options portion of Control Panel. If the initial system setting changes during the life of your application the System.Globalization.HebrewCalendar class does not automatically detect the change.
The special value 99 causes the HebrewCalendar.ToFourDigitYear(int) method to ignore the system settings and return the specified year unchanged.