Re: [Emacs-diffs] master 085c7f6 2/2: Test format-time-string with zone arg

[Paul Eggert]

Ken Brown wrote:
> This test fails on Cygwin.
>
> (format-time-string "%Y-%m-%d %H:%M:%S %z (%Z)" '(0 0 0 0)
>             "NZST-12NZDT,M9.5.0,M4.1.0/3")
>
> evaluates to "1970-01-01 12:00:00 +1200 (NZST)".  Can you give me some guidance
> as to how to track this down?  I know nothing about how time zones work.

What does this shell command do?

TZ='NZST-12NZDT,M9.5.0,M4.1.0/3' date address@hidden +'%Y-%m-%d %H:%M:%S %z 
(%Z)'

On a working system with GNU 'date', it should output this:

1970-01-01 13:00:00 +1300 (NZDT)

If it outputs "1970-01-01 12:00:00 +1200 (NZST)" on Cygwin, it's a bug in Cygwin 
not in Emacs per se. If so, perhaps we should just skip the test on Cygwin (you 
might file a Cygwin bug report). If not, I'll have some other questions to ask.