Hi Rusty,
I’m not sure if I understand your question correctly. TimeZoneCalculator offers either the possibility to include calculations within a page or post content by the usage of shortcodes or the usage of widgets which you can drag and drop to defined places in your theme.
In case your theme doesn’t support widgets at the desired position, you can also call the function directly. The implementation is different for every theme (maybe there’s an action or filter available) so it would be best to contact the theme author to get more details.
My Best,
Berny
