[Qt-interest] QDateTime daylight saving parsing time offset

[Atlant Schmidt]

Paul:

> Maybe it's just me but I've encountered so many bugs and issues with
> date/time code, I always tend to tread carefully these days. I'd
> rather ask stupid questions than wait for my app to break when the
> clocks go back :-)

  It's not just you. ;-)

  Testing our embedded assumptions around transitions to
  summertime/transitions from summertime/places that don't
  transition at all/other miscellaneous timezone changes
  and testing all of this assuming locations all around
  the world is hard, challenging work.

  Testing end-of-the-year rollover issues can be non-trivial.

  Making plans for the run-out of 32-bit time_t in 2038 is
  non-trivial. And much real-world software has a "time
  window much wider than 1970-2038 so there's a lot of
  hand-written "window-handler" code out there that also
  factors-in to your testing.

  A careful approach to date/time issues is always
  warranted.

                               Atlant



-----Original Message-----
From: qt-interest-bounces+aschmidt=dekaresearch.com at qt.nokia.com [mailto:qt-interest-bounces+aschmidt=dekaresearch.com at qt.nokia.com] On Behalf Of Paul Drummond
Sent: Wednesday, March 30, 2011 12:04
To: qt-interest at qt.nokia.com
Subject: Re: [Qt-interest] QDateTime daylight saving parsing time offset

Hi Thiago,

On 30 March 2011 16:33, Thiago Macieira <thiago at kde.org> wrote:
> I don't see why you'd spend the entire day to figure out what that +0100 means

I didn't mean I would need the whole day just for figuring out what
+0100 means.  I was in a rush this morning and got very confused about
the +0100 but that wasn't my question - I was really puzzled about why
QDateTime doesn't have the same "z" format specifier as Java
SimpleDateFormat (which I've used a lot).  Without the "z" specifier I
was unsure how to correctly convert the date string.

Maybe it's just me but I've encountered so many bugs and issues with
date/time code, I always tend to tread carefully these days. I'd
rather ask stupid questions than wait for my app to break when the
clocks go back :-)

Thanks for the responses - all helpful.

Paul Drummond.
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