27 if ($a_value && $a_value->isNull()) {
30 $this->value = $a_value;
81 return (!($this->value instanceof
ilDate) || $this->value->isNull());
89 $valid = parent::isValid();
isNull()
Is currently null.
isValidDefinition(ilADTDefinition $a_def)
ADT definition base class.
setDate(ilDateTime $a_value=null)
getDefinition()
Get definition.