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I wish QDateTime overrode the – operator and returned a QTimeSpan representing the difference between two QDateTimes (just like .NET’s TimeSpan). Since this doesn’t exist in Qt, I decided to implement it.
Unfortunately, QDateTime has no msecsTo-like function. What is the cleanest way to get the difference between two QDateTimes accurate to the millisecond?
I would probably use
a.daysTo(b)*1000*60*60*24 + a.time().msecsTo(b.time()). Note that you need to watch how close you can be, since you’re going to overflow your data type rather quickly.