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Date: Fri, 14 Aug 2015 10:00:23 +0200
From: Jan Včelák <>
To: Szabolcs Nagy <>
Subject: Re: strptime() lacks support for %z

Hello Szabolcs, 

(Please CC me in replies, I'm not subscribed to the list.)

On Thursday, August 13, 2015 10:06:50 PM Szabolcs Nagy wrote:
> the problem with parsing timezones is that it's not posix
> so the desired semantics is not clear (struct tm has no
> tz field in posix and it is not obvious how that should
> be treated in other apis that use struct tm.. glibc does
> something but it should be verified to give consistent
> behaviour if we add this to musl and there might be parsing
> corner cases when %z is not surrounded by spaces..).

I know it's not specified in POSIX strptime, however it is specified in 
strftime. I'm not sure how strictly do you want to stick to POSIX, but it 
seems reasonable to me to have the equivalent format support in both 
functions, so you can write the time stamp and parse it back.

Anyway, the format in strftime is simple and on fixed width, +hhmm or -hhmm.

So what do you suggest? Should we make a workaround for this in our project 
code? Or will you consider supporting non-POSIX format specifier in strptime 
in musl?



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