public function testToNativeDateTime() { $date = new Date(new Year(2013), Month::DECEMBER(), new MonthDay(3)); $time = new Time(new Hour(20), new Minute(50), new Second(10)); $dateTime = new DateTime($date, $time); $nativeDateTime = \DateTime::createFromFormat('Y-n-j H:i:s', '2013-12-3 20:50:10'); $this->assertEquals($nativeDateTime, $dateTime->toNativeDateTime()); }