Short version of the names for the days of the week.

IdDayShortNames: array[0..IdDaysInWeek] of string  = ( '', SShortDayNameSun, SShortDayNameMon, SShortDayNameTue, SShortDayNameWed, SShortDayNameThu, SShortDayNameFri, SShortDayNameSat );

IdDayShortNames is a constant array that contains strings representing the shortened version of the names for the days of the week.