Remove redundant check for DateTime instance
Remove redundant check for DateTime instance

Signed-off-by: Jefersson Nathan <d033e22ae348aeb5660fc2140aec35850c4da997@phpse.net>

PowerKiKi/doctrine2,holtkamp/doctrine2,stof/doctrine2,aivus/doctrine2,mikeSimonson/doctrine2,holtkamp/doctrine2,aivus/doctrine2,stof/doctrine2,Majkl578/doctrine2,localheinz/doctrine2,mikeSimonson/doctrine2,Majkl578/doctrine2,lcobucci/doctrine2,TomasVotruba/doctrine2,lcobucci/doctrine2,deeky666/doctrine2,deeky666/doctrine2,localheinz/doctrine2,PowerKiKi/doctrine2,TomasVotruba/doctrine2