[New-bugs-announce] [issue23600] tizinfo.fromutc changed for tzinfo wih StdOffset=0, DstOffset=1
Peter J C Law
report at bugs.python.org
Sat Mar 7 01:43:03 CET 2015
New submission from Peter J C Law:
There's a difference in behaviour between the ``fromutc`` method on a tzinfo between Python 2 and Python 3, though only under the specific case of Summer Time in regions whose usual offset is 0.
>From what I can tell, it's the Python 3 one which is wrong, based on it no longer matching the sample implementation provided in the docs and on it appearing to report the wrong times for ``datetime.now(tz)`` when on a machine configured for BST during June 2015.
Similar results can also be achieved using a manually constructed ``datetime`` for dates during summer 2014.
I've put the python script (and sample outputs) I used to investigate in a gist at https://gist.github.com/PeterJCLaw/d8bcc168d68acf066811#file-time_issues-py. The outputs there are for pythons 2.7.9 and 3.4.0.
components: Library (Lib)
title: tizinfo.fromutc changed for tzinfo wih StdOffset=0, DstOffset=1
versions: Python 3.4
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