Automatic changing of slider depending on season

customizr_slider_season_based.php

/* source: http://www.geekpedia.com/code152_Get-The-Current-Season.html */
function get_season() {
   $season_slider = array('/12/21'=>'winter',
                        '/09/21'=>'autumn',
                        '/06/21'=>'summer',
                        '/03/21'=>'spring',
                        '/01/01'=>'winter'); //this needed to be at Jan 1st
   foreach ($season_slider as $key => $value) // Loop through the season dates
   {
       $season_date = date("Y").$key;
       if (strtotime("now") > strtotime($season_date)) // If we're after the date of the starting season
       {
           return $value;
       }
   }
}

add_filter('tc_slider_name_id', 'season_sliders');
function season_sliders($slider_name_id){
    $sliders = tc__f('__get_option' , 'tc_sliders');
    // if there isn't a slider with a season name fallback on the home slider
    if ( tc__f('__is_home') &&
        isset( $sliders[get_season()] )
    )
        return get_season();
    return $slider_name_id; 
}