https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124539
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
We don't implement this:
The fields that make up a zone line are:
[...]
UNTIL The time at which the UT offset or the rule(s) change for a loca‐
tion. [...]
The next line must be a “continuation” line; this has the same
form as a zone line except that the string “Zone” and the name
are omitted, as the continuation line will place information
starting at the time specified as the “until” information in the
previous line in the file used by the previous line. Continua‐
tion lines may contain “until” information, just as zone lines
do, indicating that the next line is a further continuation.
We do not enforce that a continuation line follows a Zone line or continuation
line that ends with UNTIL. So we accept:
Zone Test/One 2:00 - LMT 2017 Oct 27 01:00
Zone Test/Two 1:00 - LMT
This should be rejected, because it doesn't specify what happens in Test/One
after 2017 Oct 27 at 1am
