public function get_shift_session()
 {
     $shiftSessions = ShiftSession::all();
     foreach ($shiftSessions as &$shiftSession) {
         $shiftSession->start_time = format_time(strtotime($shiftSession->start_time));
         $shiftSession->end_time = format_time(strtotime($shiftSession->end_time));
         $shiftSession->active = $shiftSession->active == 1;
     }
     return response()->json($shiftSessions);
 }