Using cronjobs possible?

I have made this function, maybe it helps 🙂

add_filter( 'widget_update_callback', 'wp_add_cronjob_widget_schedule', 90, 3 );
// Hook in the widget-visibility-time-scheduler plugin and set cronjob
   function wp_add_cronjob_widget_schedule( $widget_settings, $new_widget_settings, $old_widget_settings ) {

        $schedule_hook = 'wp_rocket_purge_widget';
        $schedule_args = array(
            'widget_id' =>      $_POST['id_base'],
            'sidebar' =>        $_POST['sidebar'],
            'widget_number' =>  $_POST['widget_number']
        );

        wp_clear_scheduled_hook( $schedule_hook, $schedule_args);

        if ( !empty( $_POST['hinjiwvts'][ 'mode' ] ) )
        {
            $offset = get_option('gmt_offset') * 3600; // WP schedule use UTC +0 time
            $trigger_event_start = $widget_settings['hinjiwvts'][ 'timestamps' ][ 'start' ] - $offset;
            $trigger_event_end = $widget_settings['hinjiwvts'][ 'timestamps' ][ 'end' ] - $offset;
            wp_schedule_single_event( $trigger_event_start, $schedule_hook, $schedule_args );
            wp_schedule_single_event( $trigger_event_end, $schedule_hook, $schedule_args );
        }

        return $widget_settings;
    }