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Mon Oct 18 20:25:27 CEST 2004 · https://mail.python.org/pipermail/python-dev/2004-October/049465.html

Tony Meyer wrote:
>>Index: _strptime.py
> 
> [...]
> 
>>+        # For some reason when Dec 31 falls on a Monday the 
>>week of the year is
>>+        # off by a week; verified on both OS X and Solaris.
>>+        elif weekday == 0 and week_of_year_start == 6 and 
>>week_of_year >= 52:
>>+            week_of_year += 1
> 
> 
> Is this right?  At the moment, if I ask for Monday in the 52nd week of 2008,
> I get the 5th of January 2009:
> 
> 
>>>>time.strptime("2008 52 1", "%Y %U %w")
> 
> (2009, 1, 5, 0, 0, 0, 0, 371, -1)
> 
> For reference, Monday in the previous week is the 22nd of December:
> 
> 
>>>>time.strptime("2008 51 1", "%Y %U %w")
> 
> (2008, 12, 22, 0, 0, 0, 0, 357, -1)
> 
> Wouldn't December 29 2008 be the right answer? This is the result without
> that if:
> 
> 
>>>>time.strptime("2008 52 1", "%Y %U %w")
> 
> (2008, 12, 29, 0, 0, 0, 0, 364, -1)
> 

Can you file a bug report about this?

And the test case I was using that triggered the need for that is 1906-12-31 
which is a Monday but changes what week it is based on whether you use U or W. 
  which makes no sense since both U and W should consider it the same week. 
Had the same result for 1917-12-31.

-Brett

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[Python-checkins] python/dist/src/Lib _strptime.py, 1.35, 1.36