Equivalent of Linux timezone in FreeBSD

From: Stephen Montgomery-Smith <montgomerysmithstephen_at_gmail.com>
Date: Thu, 27 Oct 2022 19:26:21 UTC
I am attempting to port code that uses an external variable called 
timezone, which is defined in the Linux file time.h as the number of 
seconds West of UTC for the current timezone.

Is there an equivalent of this in FreeBSD or other BSDs?

Is this the right group to ask this question?

Thanks, Stephen