class.ilADTDateDefinition.php

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<?php

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