openSUSE Programming December 2015

programming@lists.opensuse.org

2 participants
2 discussions

Re: [opensuse-programming] time string parsing with strptime on Linux and MinGW (from OBS)
by Roger Oberholtzer 11 Dec '15

11 Dec '15

On Fri, Dec 11, 2015 at 3:20 PM, Roger Oberholtzer <roger.oberholtzer(a)gmail.com> wrote: > > > On Fri, Dec 11, 2015 at 3:14 PM, Rafael Herrera <raffo(a)cdi.com> wrote: >> >> If you are going to operate on time stamps, wouldn't it be better to use >> time() to do your arithmetic? I need fractions of seconds. time() is only full seconds. And the math involves times from other systems that have their own ideas about things. And the GPS enters the picture because we need to find locations at these times. -- Roger Oberholtzer -- To unsubscribe, e-mail: opensuse-programming+unsubscribe(a)opensuse.org To contact the owner, e-mail: opensuse-programming+owner(a)opensuse.org

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[opensuse-programming] time string parsing with strptime on Linux and MinGW (from OBS)
by Roger Oberholtzer 11 Dec '15

11 Dec '15

I have been playing with time stamps and ISO 8601 format strings. I am trying to parse a string of the type: 2015-09-30T12:13:14.567Z or 2015-09-30T10:13:14.567+0200 which contain the equivalent time. Generating the strings is no problem. It is parsing the strings into seconds and fractions of seconds that is a problem. I need seconds because I need to do math on the times. The math can cause times to pass midnight, so the year/month/day part is required. It is when I parse the times that I have a problem. What I really want is the seconds in UTC/Zulu. So local time + time zone offset must also be handled. I thought I would use strptime() so I can get the time in a 'struct tm' that I can pass to timegm() to get UTC/Zulu seconds. Here is question #1: The following description claims that strptime() can parse the time zone (e.g., "+0200") via the %z specifier: http://www.gnu.org/software/libc/manual/html_node/Low_002dLevel-Time-String… But on all openSUSE versions I have tried (up to and including Leap), the man page for strptime() does not list %z as a recognized parameter. Is the man page wrong, or is openSUSE using some other strptime? The odd thing is that the inverse function strftime() does list the %z (and %Z) options. And question #2: Why doesn't MinGW from OBS contain strptime() when it does contain strftime()? I see various explanations. And it is probably just that MinGW is that way. Anyone know of a complete strptime() implementation that can be added to a library? Picking out the GNU version was less than obzious. The only other implementations I have seen are very incomplete (e.g., no support for %z). -- Roger Oberholtzer -- To unsubscribe, e-mail: opensuse-programming+unsubscribe(a)opensuse.org To contact the owner, e-mail: opensuse-programming+owner(a)opensuse.org

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openSUSE Programming December 2015