public function testCreateFromFormat()
{
$this->assertEquals(Time::get('2009-12-01')->format('Ym'), Time::createFromFormat('ym', '0912')->format('Ym'));
$this->assertEquals(Time::get('2009-12-01')->format('Ymd'), Time::createFromFormat('ymd', '091201')->format('Ymd'));
$this->assertEquals(Time::get('2009-12-01')->format('Ymd'), Time::createFromFormat('Ymd', '20091201')->format('Ymd'));
$this->assertEquals(Time::get('2009-12-01 12:14:16')->format('Ymd His'), Time::createFromFormat('Y-m-d H:i:s', '2009-12-01 12:14:16')->format('Ymd His'));
}