private function getDay($day)
 {
     if ($day == 'Su') {
         return DayOfWeek::where('name', 'Sunday')->first();
     } else {
         if ($day == 'Mo') {
             return DayOfWeek::where('name', 'Monday')->first();
         } else {
             if ($day == 'Tu') {
                 return DayOfWeek::where('name', 'Tuesday')->first();
             } else {
                 if ($day == 'We') {
                     return DayOfWeek::where('name', 'Wednesday')->first();
                 } else {
                     if ($day == 'Th') {
                         return DayOfWeek::where('name', 'Thursday')->first();
                     } else {
                         if ($day == 'Fr') {
                             return DayOfWeek::where('name', 'Friday')->first();
                         } else {
                             if ($day == 'Sa') {
                                 return DayOfWeek::where('name', 'Saturday')->first();
                             }
                         }
                     }
                 }
             }
         }
     }
 }