Re: tzset: add native Windows workaround

[Paul Eggert]

On 05/03/2017 04:31 AM, Ken Brown wrote:
> > Perhaps the Cygwin folks could be talked into changing an unset TZ to 
> > mean "ask the Windows Control Panel".
>
> This seems to already be happening.  Here's what I see on my Cygwin 
> system:
>
> $ echo $TZ
> America/New_York
>
> $ date +'%Y-%m-%d %H:%M:%S %z (%Z)'
> 2017-05-03 07:29:03 -0400 (EDT)
>
> $ TZ= date +'%Y-%m-%d %H:%M:%S %z (%Z)'
> 2017-05-03 11:29:14 +0000 (GMT)
>
> $ unset TZ
>
> $ date +'%Y-%m-%d %H:%M:%S %z (%Z)'
> 2017-05-03 07:29:30 -0400 (EDT) 

Hmm, but is the last output line because the Windows Control Panel 
specifies New York time, or because there is a 'localtime' file 
maintained by Cygwin that specifies New York time? I'm guessing the 
latter, since that's what glibc does. The former is what Bruno is asking 
for.