Re: bug#20314: [PATCH] Make output of mdate-sh deterministic

Paul Eggert wrote:
> Unfortunately that patch to Automake's mdate-sh is not portable, as TZ='UTC' is 
> not a portable setting for the TZ environment variable. POSIX says you're 
> supposed to use something like TZ='UTC0' instead. Although TZ='UTC' works when 
> glibc is used, this is not necessarily true on other POSIX platforms.

Gnulib also supports MSVC, which interprets the TZ environment variable in its
own way [1][2]. From this doc and from POSIX [3], it looks to me that
  UTC0
  GMT0
  GMT+0
  GMT-0
would all be equivalent and portable. Can you confirm this? Or does one of
these TZ values happen to enable DST?

Bruno

[1] https://msdn.microsoft.com/en-us/library/aa273389.aspx
[2] https://msdn.microsoft.com/en-us/library/90s5c885.aspx
[3] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html