GNU bug report logs - #15816
24.3; (format-time-string "%h") returns "" instead of month

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: andrea.rossetti <at> gmail.com
Subject: bug#15816: closed (Re: bug#15816: 24.3; (format-time-string "%h")
 returns "" instead of month)
Date: Wed, 06 Nov 2013 10:17:03 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#15816: 24.3; (format-time-string "%h") returns "" instead of month

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 15816 <at> debbugs.gnu.org.

-- 
15816: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=15816
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Eli Zaretskii <eliz <at> gnu.org>
To: andrea.rossetti <at> gmail.com
Cc: 15816-done <at> debbugs.gnu.org
Subject: Re: bug#15816: 24.3;
 (format-time-string "%h") returns "" instead of month
Date: Wed, 06 Nov 2013 12:16:00 +0200

> From: andrea.rossetti <at> gmail.com
> Date: Wed, 06 Nov 2013 01:05:45 +0100
> 
>   when I execute 
> 
> (format-time-string "%h")
> 
> I get a return value of "" instead of "nov" meaning
> November, the current date month. On the contrary,
> execution of
> 
> (format-time-string "%b")
> 
> correctly returns "nov". I suppose this is
> due to the runtime of my Windows installation
> (an ordinary Windows 7 64-bit) not supporting
> C99 format modifiers of the C function "strftime".

Indeed, Windows version of strftime doesn't support %h.

>   If it affects other users too, my suggestion is to
> simply add a note in the docstring of format-time-string,
> saying that modifier "%h" requires a C99-compliant
> runtime. 

Done.

[Message part 3 (message/rfc822, inline)]

From: andrea.rossetti <at> gmail.com
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; (format-time-string "%h") returns "" instead of month
Date: Wed, 06 Nov 2013 01:05:45 +0100

Hello,

  when I execute 

(format-time-string "%h")

I get a return value of "" instead of "nov" meaning
November, the current date month. On the contrary,
execution of

(format-time-string "%b")

correctly returns "nov". I suppose this is
due to the runtime of my Windows installation
(an ordinary Windows 7 64-bit) not supporting
C99 format modifiers of the C function "strftime".

  My conjecture came after reading of this page:
http://www.cplusplus.com/reference/ctime/strftime/ .

  I kindly ask if someone good-willed Emacs user
might see if the problem happens on his/her
Windows machine. A test on Linux could be also
a useful counterexample.

  If it affects other users too, my suggestion is to
simply add a note in the docstring of format-time-string,
saying that modifier "%h" requires a C99-compliant
runtime. 

  Thanks for your attention, kindest regards.

  Andrea




In GNU Emacs 24.3.1 (i386-mingw-nt6.1.7600)
 of 2013-03-17 on MARVIN
Windowing system distributor `Microsoft Corp.', version 6.1.7600
Configured using:
 `configure --with-gcc (4.7) --cflags
 -ID:/devel/emacs/libs/libXpm-3.5.8/include
 -ID:/devel/emacs/libs/libXpm-3.5.8/src
 -ID:/devel/emacs/libs/libpng-dev_1.4.3-1/include
 -ID:/devel/emacs/libs/zlib-dev_1.2.5-2/include
 -ID:/devel/emacs/libs/giflib-4.1.4-1/include
 -ID:/devel/emacs/libs/jpeg-6b-4/include
 -ID:/devel/emacs/libs/tiff-3.8.2-1/include
 -ID:/devel/emacs/libs/gnutls-3.0.9/include
 -ID:/devel/emacs/libs/libiconv-1.13.1-1-dev/include
 -ID:/devel/emacs/libs/libxml2-2.7.8/include/libxml2'

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w h e n SPC e x e c u t i n g SPC w i t h SPC C - j 
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" n o v " : <return> <return> ( f o r m a t - t i m 
e - s t r i n g SPC " % h " ) C-j <return> <return> 
<return> " % b " SPC w o r k s SPC f o r SPC m e : 
<return> <return> ( f o r m a t - t i m e - s t r i 
n g SPC " % b " ) C-j O K : SPC I SPC g o t SPC " n 
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