Ashley Anderson <agande...@gmail.com> added the comment:
The example that triggered the issue in testing was January 1, 1905. The ISO
date for this day is 1904 52 7. This is reported correctly if you use
datetime.isocalendar() or datetime.strftime('%G'), but you get 1905 if you use
datetime.strftime('%Y'). When it's read back in it causes the test to fail
because ISO '1904 52 7' is different from ISO '1905 52 7'.
Likewise if you consider a year starting on a Tuesday, Wednesday, or Thursday,
there will be several days at the end of the previous year that will have an
ISO year ahead of their Gregorian representation.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12006>
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