UTC pandas errors

utc_pandas.txt

In [1]: import pandas

In [2]: import datetime

In [3]: import matplotlib.dates as mdates

In [4]: start = mdates.num2date(mdates.datestr2num('2012-1-1'))

In [5]: end = mdates.num2date(mdates.datestr2num('2012-6-1'))

In [6]: pandas.DatetimeIndex(start=start, end=end, freq='MS')
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-6-8af3211e7c82> in <module>()
----> 1 pandas.DatetimeIndex(start=start, end=end, freq='MS')

c:\python27\lib\site-packages\pandas\tseries\index.pyc in __new__(cls, data, freq, start, end, periods, copy, name, tz, verify_integrity, normalize, **kwds)
    180         if data is None:
    181             return cls._generate(start, end, periods, name, offset,
--> 182                                  tz=tz, normalize=normalize)
    183
    184         if not isinstance(data, np.ndarray):

c:\python27\lib\site-packages\pandas\tseries\index.pyc in _generate(cls, start, end, periods, name, offset, tz, normalize)
    364                                           offset=offset, name=name)
    365             else:
--> 366                 index = _generate_regular_range(start, end, periods, offset)
    367
    368             if tz is not None and getattr(index, 'tz', None) is None:

c:\python27\lib\site-packages\pandas\tseries\index.pyc in _generate_regular_range(start, end, periods, offset)
   1437     else:
   1438         if isinstance(start, Timestamp):
-> 1439             start = start.to_pydatetime()
   1440
   1441         if isinstance(end, Timestamp):

c:\python27\lib\site-packages\pandas\lib.pyd in pandas.lib.Timestamp.to_pydatetime (pandas\src\tseries.c:29680)()

c:\python27\lib\site-packages\pandas\lib.pyd in pandas.lib.convert_to_tsobject (pandas\src\tseries.c:33831)()

AttributeError: '_UTC' object has no attribute 'normalize'

In [7]: pandas.version.version
Out[7]: '0.9.1'