public function testSavningDateTimeAndCarbonInstances()
 {
     $now = Carbon::now();
     $dt = new DateTime();
     $w = Wiz::create(['fiz' => $now, 'biz' => $dt]);
     $format = Wiz::getDateFormat();
     $fetched = Wiz::first();
     $this->assertEquals($now->format(Wiz::getDateFormat()), $fetched->fiz);
     $this->assertEquals($now->format(Wiz::getDateFormat()), $fetched->biz);
     $tomorrow = Carbon::now()->addDay();
     $after = Carbon::now()->addDays(2);
     $fetched->fiz = $tomorrow;
     $fetched->biz = $after;
     $fetched->save();
     $updated = Wiz::first();
     $this->assertEquals($tomorrow->format(Wiz::getDateFormat()), $updated->fiz);
     $this->assertEquals($after->format(Wiz::getDateFormat()), $updated->biz);
 }