Support Forum

I’m not 100% sure it will work, but you could try this:

add_filter( 'wpsp_date_output', function( $output ) {
    return sprintf(
        '<span class="wp-show-posts-posted-on wp-show-posts-meta">
            %1$s %2$s
        </span>',
        do_shortcode( '[gd_post_badge key="event_dates" condition="is_not_empty" badge="%%event_start_date%%" bg_color="#ffffff" txt_color="#1339f0" alignment="center"]' ),
        do_shortcode( '[gd_post_badge key="event_dates" condition="is_not_empty" badge="%%event_end_date%%" bg_color="#ffffff" txt_color="#1339f0" alignment="center"]' );
    );
} );

You’ll also need to add the snippet they provided.