Alexander Belopolsky added the comment:
Note that round-trip also fails in weeks 52-53. For example,
>>> datetime.strptime('2014 53 6', '%Y %W %w')
datetime.datetime(2015, 1, 10, 0, 0)
>>> datetime.strptime('2014 53 6', '%Y %W %w').strftime('%Y %W %w')
'2015 01 6'
If we decide to make "2015 0 0" invalid for format '%Y %W %w', we should
probably invalidate the entire week 53 in 2014 for consistency. However, I
don't think there are any C implementations that would have a problem with such
dates.
Overall, I am inclined to accept Jim's solution for 3.5, but I am not sure
about the maintenance branches.
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