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Date: Thu, 14 Aug 2014 19:48:44 -0400
From: Alec Salazar <>
Subject: Re: XPG4

Yes. D_T_FMT yields a similar output to _DATE_FMT, but it lacks the
timezone identifier. So I had thought to use the format specifiers directly
and bypass the call to nl_langinfo. I was told that _DATE_FMT was added
because Sun made everything up to date with the latest xopen std. I don't
yet grok the localization stuff. So, I'm wondering if passing the format
specifiers into strftime directly would remove any localizing done by

On Thu, Aug 14, 2014 at 7:40 PM, Rich Felker <> wrote:

> On Thu, Aug 14, 2014 at 07:28:53PM -0400, Alec Salazar wrote:
> > I seem to be taking a wrong turn somewhere. Running find . -type f
> -print0
> > | xargs -0 /bin/grep D_FMT in /usr/include for the installed 1.1.4
> yields:
> > ../langinfo.h:#define D_FMT 0x20029
> > ../langinfo.h:#define ERA_D_FMT 0x2002E
> > Pulling the latest sources and running the same command in gitdir yields:
> > ../src/time/strptime.c:                  s = strptime(s,
> nl_langinfo(D_FMT),
> > tm);
> > ../src/time/strftime.c:          item = D_FMT;
> > ../include/langinfo.h:#define D_FMT 0x20029
> > ../include/langinfo.h:#define ERA_D_FMT 0x2002E
> > Neither directory yields a result for DATE_FMT. Am I botching the
> unix-fu,
> > barking up the wrong tree or something else entirely?
> Oh, perhaps it's my mistake and the proper name is D_FMT. Or did you
> expect _DATE_FMT to give something different from what D_FMT gives?
> Also I think you can just use %x directly to get this, rather than
> looking it up via nl_langinfo first.
> Rich

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