On Py3 strptime("２００９", "%Y") fails:
>>> strptime("２００９", "%Y")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.0/_strptime.py", line 454, in _strptime_time
    return _strptime(data_string, format)[0]
  File "/usr/local/lib/python3.0/_strptime.py", line 325, in _strptime
    (data_string, format))
ValueError: time data '２００９' does not match format '%Y'

but non-ascii numbers are supported elsewhere:
>>> int("２００９")
2009
>>> re.match("^\d{4}$", "２００９").group()
'２００９'

The problem seems to be at the line 265 of _strptime.py:
        return re_compile(self.pattern(format), IGNORECASE | ASCII)
The ASCII flag prevent the regex to work properly with '２００９':
>>> re.match("^\d{4}$", "２００９", re.ASCII)
>>>

I tried to remove the ASCII flag and it worked fine.

On Py2.x the problem is the same:
>>> strptime(u"２００９", "%Y")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/_strptime.py", line 330, in strptime
    (data_string, format))
ValueError>>>
>>> int(u"２００９")
2009
>>> re.match("^\d{4}$", u"２００９")

Here there's probably to add the re.UNICODE flag at the line 265 (untested):
        return re_compile(self.pattern(format), IGNORECASE | UNICODE)
in order to make it work:
>>> re.match("^\d{4}$", u"２００９", re.U).group()
u'\uff12\uff10\uff10\uff19'