Antti Haapala added the comment:
Alexander: that is true, because they are *separate* conversion flags.
However even the POSIX standard strptime has some leniency: '%m` and `%d`
accept the numbers *without* leading zeroes. This actually also means that one
cannot use `%Y%m%d` to detect an invalid ISO timestamp:
>>> datetime.datetime.strptime('111122', '%Y%m%d')
datetime.datetime(1111, 2, 2, 0, 0)
The `arrow` library depends on the supposed "strict" behaviour of strptime that
has never been guaranteed, which often results in very buggy behaviour under
some conditions.
----
(Also, it must be noted that GNU date program doesn't use these formats to
*parse* dates, and POSIX strptime in *C* library outright ignores any timezone
information)
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<http://bugs.python.org/issue24954>
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