business_open()

nebula()->business_open($date, $general)

        public function business_open($date=null, $general=false){
            $override = apply_filters('pre_business_open', null, $date, $general);
            if ( isset($override) ){return $override;}

            //Check object cache first so the full loop logic does not need to run more than once
            $is_business_open = wp_cache_get('is_business_open');
            if ( is_string($is_business_open) ){
                if ( strtolower($is_business_open) === 'true' ){
                    return true;
                }

                return false;
            }

            nebula()->timer('Is Business Open');

            if ( $this->has_business_hours() ){
                if ( empty($date) || $date === 'now' ){
                    $date = time();
                } elseif ( strtotime($date) ){
                    $date = strtotime($date . ' ' . date('g:ia', strtotime('now')));
                }
                $today = strtolower(date('l', $date));

                $businessHours = array();
                foreach ( array('sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday') as $weekday ){
                    $businessHours[$weekday] = array(
                        'enabled' => $this->get_option('business_hours_' . $weekday . '_enabled'),
                        'open' => $this->get_option('business_hours_' . $weekday . '_open'),
                        'close' => $this->get_option('business_hours_' . $weekday . '_close')
                    );
                }

                $days_off = ( !empty($this->get_option('business_hours_closed')) )? $this->get_option('business_hours_closed') : ''; //Ensure correct type
                $days_off = array_filter(explode(', ', $days_off));
                if ( !empty($days_off) ){
                    foreach ( $days_off as $key => $day_off ){
                        $days_off[$key] = strtotime($day_off . ' ' . date('Y', $date));

                        if ( date('N', $days_off[$key]) === 6 ){ //If the date is a Saturday
                            $days_off[$key] = strtotime(date('F j, Y', $days_off[$key]) . ' -1 day');
                        } elseif ( date('N', $days_off[$key]) === 7 ){ //If the date is a Sunday
                            $days_off[$key] = strtotime(date('F j, Y', $days_off[$key]) . ' +1 day');
                        }

                        if ( date('Ymd', $days_off[$key]) === date('Ymd', $date) ){
                            nebula()->timer('Is Business Open', 'end');
                            wp_cache_set('is_business_open', 'false');
                            return false;
                        }
                    }
                }

                if ( $businessHours[$today]['enabled'] == '1' ){ //If the Nebula Options checkmark is checked for this day of the week.
                    if ( !empty($general) ){
                        nebula()->timer('Is Business Open', 'end');
                        wp_cache_set('is_business_open', 'true');
                        return true;
                    }

                    $openToday = date('Gi', strtotime($businessHours[$today]['open']));
                    $closeToday = date('Gi', strtotime($businessHours[$today]['close'])-1); //Subtract one second to ensure midnight represents the same day
                    if ( date('Gi', $date) >= $openToday && date('Gi', $date) <= $closeToday ){
                        nebula()->timer('Is Business Open', 'end');
                        wp_cache_set('is_business_open', 'true');
                        return true;
                    }
                }
            }

            nebula()->timer('Is Business Open', 'end');
            wp_cache_set('is_business_open', 'false');
            return false;
        }

add_filter('pre_business_open', 'my_custom_business_open', 10, 3); //The last integer must be 1 more than the actual parameters
function my_custom_business_open($null, $date, $general){ //$null is required, but can be ignored
    //Write your own code here

    return true; //Return true to prevent the original function from running afterwords
}

 add_filter('pre_business_open', '__return_false');