openSUSE Programming November 2015

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[opensuse-programming] time string parsing with strptime on Linux and MinGW (from OBS)

by Roger Oberholtzer

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 November 2015