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ERROR: test_dateindex_conversion (pandas.tseries.tests.test_converter.TestDateTimeConverter)
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Traceback (most recent call last):
  File "/tmp/buildd/pandas-0.14.1/debian/tmp/usr/lib/python2.7/dist-packages/pandas/tseries/tests/test_converter.py", line 77, in test_dateindex_conversion
    xp = converter.dates.date2num(dateindex)
  File "/usr/lib/python2.7/dist-packages/matplotlib/dates.py", line 310, in date2num
    return _to_ordinalf_np_vectorized(d)
  File "/usr/lib/python2.7/dist-packages/numpy/lib/function_base.py", line 1573, in __call__
    return self._vectorize_call(func=func, args=vargs)
  File "/usr/lib/python2.7/dist-packages/numpy/lib/function_base.py", line 1633, in _vectorize_call
    ufunc, otypes = self._get_ufunc_and_otypes(func=func, args=args)
  File "/usr/lib/python2.7/dist-packages/numpy/lib/function_base.py", line 1597, in _get_ufunc_and_otypes
    outputs = func(*inputs)
  File "/usr/lib/python2.7/dist-packages/matplotlib/dates.py", line 204, in _to_ordinalf
    base = float(dt.toordinal())
AttributeError: 'numpy.datetime64' object has no attribute 'toordinal'

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