The "proper" way to set 12h time?

So I'm needing to re-create my Thunderbird profile and in the calendar my times have reverted back to 24h versus my preferred 12h format. I did some hack a while back within Thunderbird to override this and get 12h format but I'm not finding my notes on just what I did to accomplish this. However, at the end of the day it was a "hack" in the wrong place... supposedly Thunderbird bases its time format on the system locale which is where I should be setting my preference.

Ok, so fine: how do I fix this at the FreeBSD OS level so TB (and presumably everything else) picks up on it? Output of locale:

Code:
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_ALL=

"date" output is in 24h format.
FreeBSD 13.2-RELEASE
 
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