src/app/n2n/impl/persistence/orm/property/DateTimeEntityProperty.php
public function mergeValue($value, $sameEntity, MergeOperation $mergeOperation) {
		if ($sameEntity || $value === null) {
			return $value;
		}
		
		ArgUtils::assertTrue($value instanceof \DateTime);
		return clone $value;
	}
public function mergeValue($value, $sameEntity, MergeOperation $mergeOperation) {
		if ($sameEntity || $value === null) {
			return $value;
		}
		
		ArgUtils::assertTrue($value instanceof \DateTime);
		return clone $value;
	}
/* (non-PHPdoc)
@see \n2n\persistence\orm\property\EntityProperty::mergeValue()