Howto add QTime to a QDateTime object?

cdwijs

Hi All,

I have a QDateTime object, and I would like to add a QTime to it.

How can I do this?

kind regards,
Cedric

the_

Do I understand correctly that you want to set the time of a QDateTime object from a QTime object?

   QDateTime::setTime(const QTime &time)

allows you to set the time

cdwijs

Hi The_,

Almost. I have a QTimeEdit, and 2 QTimeDate Edits:
QTimeEdit time;
QTimeDate timedate1;
QTimeDate timedate2;

I would like to do this:
timedate2 = timedate1 + time;

Kind regards,
Cedric

the_

@cdwijs

Maybe there is an easier way but you can calculate the miliseconds since start of day from your QTime and add it to the QDateTime then.

datetime2 = datetime.addMSecs(time.msecsSinceStartOfDay());

cdwijs

Thanks. It works when I perform it in a few intermediate steps, but I get an error when I do it in one big step:
'((MainWindow*)this)->MainWindow::twilightDurationEdit->QDateTimeEdit::time' does not have class type
datetime = dateTimeEdit->dateTime().addMSecs(twilightDurationEdit->time.fromMSecsSinceStartOfDay());
^
This code works:
QDateTime datetime;
QTime time;

datetime = dateTimeEdit->dateTime();
datetime = datetime.addDays(twilightDaysSpin->value());
time = twilightDurationEdit->time();
msecs = time.msecsSinceStartOfDay();
datetime = datetime.addMSecs(msecs);

This code doesn't compile:
datetime = dateTimeEdit->dateTime().addMSecs(twilightDurationEdit->time.fromMSecsSinceStartOfDay());

Kind regards,
Cedric

kshegunov

@the_, @cdwijs
The problem is, QDateTime keeps both the date and the time of day, so is there a guarantee that QDateTime points to the same point in time from which QTime starts? I really doubt it.

@cdwijs

twilightDurationEdit->time.fromMSecsSinceStartOfDay()

You are using a function (i.e. QDateTime::time) as a variable.
The last should be:

twilightDurationEdit->time().fromMSecsSinceStartOfDay()

However, you consider the note my post starts with.