It should be %Y-%m-%d
:
>>> s = "2014-04-07"
>>> datetime.datetime.strptime(s, "%Y-%m-%d").date()
datetime.date(2014, 4, 7)
According to the documentation:
%Y
stands for a year with century as a decimal number
%m
- month as a zero-padded decimal number
%d
- day of the month as a zero-padded decimal number
Hope that helps.
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