function SetCalendarDate ( aDate : TDateTime ) : boolean ;
Description
The SetCalendarDate function allows you to set the current calendar date
by the date specified in the aDate parameter. The current CalendarMonth ,
CalendarYear and currently highlighted cell will be changed to reflect the
specified date.
This function will return a false result if the specified date is less
than January 1st, 1900 or greater than December 31st, 2099.
