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Editorial Team
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Asked: 2026-06-03T17:41:02+00:00

I’m using Python 2.6.6 and PyQt4. I have a start QDateTime object and I

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I’m using Python 2.6.6 and PyQt4. I have a start QDateTime object and I am iteratively adding 60 seconds to create a list of every minute within a given time span. I have discovered that there are several cases where adding two different seconds values to the QDateTime object produces the same time.

Here’s an example of the problem:

from PyQt4 import QtCore

start = QtCore.QDateTime.fromString("2010-11-01 00:00", "yyyy-MM-dd hh:mm")

print start.addSecs(522540).toString("yyyy-MM-dd hh:mm")
print start.addSecs(526140).toString("yyyy-MM-dd hh:mm")

And the resulting output:

2010-11-07 01:09
2010-11-07 01:09

I’ve been banging my head on the keyboard trying to figure this out. What am I doing incorrectly?

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1 Answer

  1. Editorial Team

    it probably depends on your locale settings:

    seems DST in the United States and other countries ended on 2010-11-07…

    so i’d bet it’s a result of that.

    if you get any strange values from doing calculations with dates, always check if there hasn’t been DST change or a leap year and consider different locales. sadly time isn’t always as linear as it seems.

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