Custom Field Block doesn’t show date properly

It should be possible to output the date format with some custom code, similar to this example:
https://bootstrapped.ventures/wp-ultimate-post-grid/acf-in-the-template-editor/

Kind regards,
Brecht

Thanks for the response. In which file should I add this code?

Try adding something like this to your theme’s functions.php file:

function wpupg_acf( $output, $post, $block ) {
    if ( 'acf_field' === $block->key ) {
         $acf_field = get_field( $block->key, $post->ID );
         $date = new DateTime( $acf_field );
         $output = $date->format('j M Y');
    }
    return $output;
}
add_filter( 'wpupg_output_grid_block_custom-field', 'wpupg_acf', 10, 3 );

Great, It worked!