Getting a Trello Card created-at timestamp

It seems like Trello has a bit of a cryptic way to store a Card timestamp. The created-at timestamp for a Trello Card is the first 8 hex characters of the Card id/guid.

Those 8 hex characters need to be converted to their equivalent decimal value. The decimal value is the Epoch timestamp, which can be converted to a localized timestamp.

My issue is converting the 8 characters from hex to decimal. Any thoughts on how to do that in Xano?