QTimeSpan: interest?

giesbert

With DST (and respectivly 23/25 h days) QDateTiem has a problem, and afaik it's not fixed up to now.

You do not get out of QDateTime it its the first 2 o'clock in the morning or the second one :-( (DST in Germany happens at 3 o'clock with a switch back to 2 o'clock, so you have 2 o'clock two times that day).

Same applies to the QDateTimeEdit, there you don't know, which of the two you set by setting 2:30 ...

Olorin5800

Nice class. Voted for it.

andre

@Gerolf:
So, the problem is, that 02:30 on the date the clock goes back an hour is simply an ambigous time. I am not sure there is anything you can do about that, other than specifying the time in UTC instead. There are "bugreports":http://bugreports.qt.nokia.com/browse/QTBUG-10219 in Jira to ask for a better support for timezones in QDateTime.

milot.shala

Great work. I voted for it because I needed this a while ago, and for sure I will need it in the future.

AS.Sri

Thanks a lot Andre, voted in JIRA.

sabrog

Thanks, André. I voted.

janarve

A timespan has some pitfalls:
If it uses walltime as the two reference points, you must handle cases where start time is actually after end time. This is because there system time can be updated from a time source (and might jump back in time). IIRC on cell phones this happens quite often, but it can also happen if your desktop system is connected to a NTP time source. It can also happen if you are not connected to a external time source, for instance due to DST changes.
This is also mentioned in the documentation for QTime::elapsed(), which is often used for the same purpose. (actually it says that the result is undefined)

andre

Thank you for your comment, but that case is handled. The proposed QTimeSpan handles negative time spans just fine.

DerManu

Voted and Watched.
So, after two years, are timespans still not added to Qt? What a shame!

andre

Note that that is also a due to Sean and me not pushing hard enough to get it in after the first attempt.

utcenter

Useful class - voted.

JulienMaille

voted too

romanick

It's very needed class!
+1

Benito1979

I need this class, seems to be very useful!!!

Andrey Dyatlov

Hello Andre,
I think QTimeSpan class is really a missing part of the Qt Project. Thanks for yours and Sean's efforts!
I have a question regarding the legality. Is it possible to use your sources in a commercial project (we use Qt with LGPL) as a part of a code-base (do not incorporate it to the Qt libs) before it becomes a part of Qt officially?
Thanks!

UPD: English has been slightly improved.

andre

I was planning to try and pick this project up again, against Qt 5 and aim for inclusion in 5.2 (finally). I have no objection to others using the code in the meantime, as long as that is in accordance with their usage of Qt.

Lykurg

Hi Andre,

What's the current state of QTimeSpan. I could not find any related in Gerrit.

Thanks.

andre

There has been no recent active development on it, unfortunately. Life got in the way... Note that the code that is there works just fine.

Talkless

Please update Qt bug report link to https://bugreports.qt.io/browse/QTBUG-16556