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digitalmars.D.bugs - [Issue 8646] New: std.datetime ISO strings are incompatible with ISO 8601

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           Summary: std.datetime ISO strings are incompatible with ISO
                    8601
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: jens.k.mueller gmx.de


--- Comment #0 from jens.k.mueller gmx.de 2012-09-12 10:03:23 PDT ---
According to http://en.wikipedia.org/wiki/ISO_8601 ISO 8601 date time strings
contain nothing below seconds. But the std.datetime's ISO function contain
values for this. Hence, it is currently incompatible with ISO 8601.

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Jonathan M Davis <jmdavisProg gmx.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |jmdavisProg gmx.com
         Resolution|                            |INVALID


--- Comment #1 from Jonathan M Davis <jmdavisProg gmx.com> 2012-09-12 10:38:22
PDT ---
It's perfectly legit. Reread the Times section. You can have "decimal
fractions" (which is a really screwed up term IMHO, since decimals and
fractions are different things, but whatever) to any of the three time elements
- including seconds. The number of decimal places to use "needs to be agreed to
by the communicating parties," but the notation is correct. If there's a
problem, it's the fact that fromISOExtString doesn't accept variants of
ISO-8601 that toISOExtString doesn't use (e.g. using a comma instead of a
decimal or having decimal fractions for minutes). But they both follow the
standard.

There are other places online that fractional seconds are discussed as well.
e.g. http://www.cl.cam.ac.uk/~mgk25/iso-time.html

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--- Comment #2 from jens.k.mueller gmx.de 2012-09-12 12:42:16 PDT ---
Thanks for your prompt reply. I see now that the standard allows for fractional
seconds. In my use case I'm programming against against a specification that
demands ISO 8601 conformity without fractional seconds. Is there an easy way to
remove the fractional seconds? Because if there are no then toISOExtString()
won't return them. My current workaround is quite tedious for this common
operation.

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--- Comment #3 from Jonathan M Davis <jmdavisProg gmx.com> 2012-09-12 13:30:04
PDT ---
Just strip the fractional seconds from the SysTime by setting its fracSec
property to 0. So, something like

sysTime.fracSec = FracSec.from!"msecs"(0);

(I should probably add a static property to FracSec which gives you 0, but
there isn't anything like that right now). Then when you call toISOString or
toISOExtString, it doesn't have any fractional seconds, so the resultant string
won't have them.

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--- Comment #4 from jens.k.mueller gmx.de 2012-09-12 13:49:21 PDT ---
Thanks. This looks good.

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