class.ilADTDateTimeDefinition.php

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<?php

class ilADTDateTimeDefinition extends ilADTDefinition
{       
        // comparison
                        
        public function isComparableTo(ilADT $a_adt)
        {
                // has to be date-based
                return ($a_adt instanceof ilADTDateTime || $a_adt instanceof ilADTDate);
        }               
}

?>