Rated 5 out of 5 stars

Very sophisticated, seems to work well. Great work!

Just missing the possibility to format the date/time in UTC. As there is a timezone-variable already, this should just be a matter of a simple calendar calculation.

EDIT: Thanks for your quick answer, the feature is already there actually and seems to work well!

This review is for a previous version of the add-on (4.0b3). 

Thanksfor the review! Maybe check out the variables tab (search for timezone using the search box top left). There is a switch called

%X:=timezone(tz)%

which forces some time zone calculations on the following date variables, it might be what you're looking for...