Good evening Jake and welcome back!
Thank you for reaching out to us.
I would love to help you with this topic.
I am pretty sure this would be achievable through some template customization.
You might want to read our Themer’s guide to get a sense of how that works.
Alas it is not currently a built-in feature, but it would be a very cool one!
In fact, you can suggest it or cast your vote on other features in our User Voice forum.
In the meantime, there are at least a couple of plugins out there:
- https://wordpress.org/plugins/hebrewdates/
- https://wordpress.org/plugins/wordpress-hebrew-date/
It would be interesting to see if you can hook to that code.
I also found the following thread on a similar topic, but it’s untested: https://theeventscalendar.com/support/forums/topic/where-to-add-this-code/
In short, my best recommendation would be to hire one of our recommended customizers to do the customization for you.
Best regards,
Geoff B.