In this diff https://github.com/openbsd/src/commit/c9da469ac9133c60159589ec32d42d777401961c the external variables daylight and timezone were added to time.h. However, they're not documented in any man page. In contrast, the external variable tzname is described in ctime.3: https://man.openbsd.org/ctime.3 I think daylight and timezone could also be described in ctime.3
An alternative is that all three of time.h's extern variables could be documented in tzset.3 https://man.openbsd.org/tzset.3 I see this approach taken in Solaris man pages and POSIX. https://docs.oracle.com/cd/E88353_01/html/E37843/ctime-3c.html https://pubs.opengroup.org/onlinepubs/9699919799/functions/tzset.html
