Online PHP editor | output for 4UAT8

<?php class C{ protected $date; public function __construct(){ $this->date=new DateTime(); } public function getCurrent(){ return clone $this->date; } } class A extends C{ public function getDate(){ return $this->getCurrent()->add(new DateInterval('P10D')); } public function getDateAgain(){ return $this->getCurrent()->add(new DateInterval('P10D')); } } class B extends C{ public function getDate(){ return $this->getCurrent()->add(new DateInterval('P20D')); } } $a=new A(); $b=new B(); echo $a->getDate()->format('Y-m-d') . "\n"; echo $b->getDate()->format('Y-m-d') . "\n"; echo $a->getDateAgain()->format('Y-m-d') . "\n";