Profile: andreaV-4

function auto_generate_month_year_from_date_field($post_id) {
    // Check if it's the correct post type
    if (get_post_type($post_id) == 'YOUR_POST_TYPE') {
         
        // Retrieve the date field
        $date_field = get_post_meta($post_id, 'wpcf-YOUR-CUSTOM-DATE-FIELD-SLUG', true);
 
        if (!empty($date_field)) {
            // Convert the timestamp to a DateTime object
            $date_obj = DateTime::createFromFormat('U', $date_field);
 
            // Check if date creation was successful
            if ($date_obj) {
                // Extract the year and month
                $year = date_format($date_obj, "Y");
                $month = date_format($date_obj, "m");
 
                // Update the custom fields with year and month
                update_post_meta($post_id, 'wpcf-YEAR-FIELD-SLUG', $year);
                update_post_meta($post_id, 'wpcf-MONTH-FIELD-SLUG', $month);
            }
        }
    }
}
add_action('save_post', 'auto_generate_month_year_from_date_field', 101);