Sergey Bon. <s...@pm.me> added the comment:

Not following msg332388 would lead to this:


# Sunday of the week 53

>>> datetime.strptime ('2017 Sun 53', '%Y %a %U')
datetime.datetime(2017, 12, 31, 0, 0)


# First day of the week 53
# oops! assumed Monday is the first day of the week but 2017 ends on Sunday

>>> datetime.strptime ('2017 53',     '%Y %U')
datetime.datetime(2018, 1, 1, 0, 0)

>>> datetime.strptime ('2017 Mon 53', '%Y %a %U')
datetime.datetime(2018, 1, 1, 0, 0)

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue30802>
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