How does the time zone info get updated?

[Ed Maste]

On Tue, 5 Jan 2021 at 14:51, Stefan Esser <se at freebsd.org> wrote:
>
> Yes, and they are not considered critical security fixes and thus
> are not available as patches for those that install binary releases.

In fact they are released as errata updates through FreeBSD-update.
See for example FreeBSD-EN-20:20.tzdata
https://www.freebsd.org/security/advisories/FreeBSD-EN-20:20.tzdata.asc