HTML

 Add Patreon link

<a  href="[add url of your Patreon page]">

<button class="patreon-button">Become a patron!</button></a>

Xpath Code Snippets

 Convert UTC date time to local date time

fn:adjust-dateTime-to-timezone(xs:dateTime($value), xs:dayTimeDuration('PT2H'))

PT2H means UTC+2