public function testIsSameDate()
{
$date1 = new Date('2015-01-03 15:00:00');
$date2 = new Date('2015-01-03 16:00:00');
$this->assertTrue($date1->isSameDay($date2));
$date2 = new Date('2015-01-04 16:00:00');
$this->assertFalse($date1->isSameDay($date2));
}