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
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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
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