IMPROVEMENT: drop down hours

Right now the user has to scroll from 12:00am to their starting point of their opening hour. Since MOST people don’t start doing business at 12:00am, may I suggest including the following improvement by replacing the following function with my code:

classes/bookingultra.service.php

//returns the business hours drop down
        public function get_business_hours_drop_down_for_staff($day, $cbox_id, $select_start_to_class, $staff_id)
        {
                global  $bookingultrapro;

                $hours = 24; //amount of hours working in day
                $min_minutes = $bookingultrapro->get_option('bup_time_slot_length');

                if($min_minutes ==''){$min_minutes=15;}

                $hours = (60/$min_minutes) *$hours;
                $min_minutes=$min_minutes*60;

                $html .= '<select id="'.$cbox_id.'" name="'.$cbox_id.'" class="'.$select_start_to_class.'">';

                //get default value for this week's day
                if($select_start_to_class=='bup_select_start')
                {
                        $from_to_value = 'from';

                }else{

                        $from_to_value = 'to';

                }

                //if($from_to_value == 'from')
                //{
        // ben          $html .= '<option '.$selected.' value="">'.__('OFF','bookingup').'</option>';
                //}     

                //check selected value
                $selected_value = $this->get_business_hour_option($day, $from_to_value, $staff_id);

                for($i = 0; $i <= $hours ; $i++)
                {
                        $minutes_to_add = $min_minutes * $i; // add 30 - 60 - 90 etc.
                        $timeslot = date('H:i:s', strtotime(0)+$minutes_to_add);

                        $selected = '';
                        if($selected_value==date('H:i', strtotime($timeslot)))
                        {
                                $selected = 'selected="selected"';

                        }elseif($selected_value=='24:00' && date('H:i', strtotime($timeslot)) =='00:00'){

                                $selected = 'selected="selected"';

                    }

                        if($from_to_value == 'to' && $i == 48)
                        {
                                $sel_value ='24:00';

                        }else{

                                $sel_value =date('H:i', strtotime($timeslot));

                        }

                        //echo "hours:" . $hours;

                        $html .= '<option value="'.$sel_value.'" '.$selected.'  >'.date('h:i A', strtotime($timeslot)).'</option>';

                }
                if(!$selected) $selected_OFF = 'selected="selected"'; // ben
                $html = str_replace('<option value="08:00"   >', '<option value="" '.$selected_OFF.'>'.__("OFF",'bookingup').'</option><option value="08:00">', $html); // ben  

                $html .='</select>';

                return $html;

        }

https://wordpress.org/plugins/booking-ultra-pro/