Hi!
You’ll need to first change it to unix timestamp and then use
date_i18n function.. here’s a snippet:
<?php $timestamp = strtotime(get_field('yourdatefield')); ?>
<time datetime="<?php echo date(DATE_W3C); ?>" pubdate class="updated"><?php echo date_i18n( 'j M', $timestamp); ?></time>
The key parts here is the first row and then the date_i18n function.. Change the first parameter of date_i18n (j M) to whatever timeformat you require 🙂