Error in Timezone handling of DataFrames when joined #2317
Description
When joining two DataFrames with localized indexes, the resulting DataFrame has erroneous Timestamps. (It appears that at some point the timestamps are interpreted at UTC without a correct timezone correction?)
Sample code:
In [94]: test1 = pandas.DataFrame(numpy.zeros((6,3)),index=pandas.tseries.index.date_range("2012-11-15 00:00:00", periods=6, freq="100L", tz="US/Central"))
In [95]: test2 = pandas.DataFrame(numpy.zeros((3,3)),index=pandas.tseries.index.date_range("2012-11-15 00:00:00", periods=3, freq="250L", tz="US/Central"), columns=range(3,6))
In [96]: test1
Out[96]:
0 1 2
2012-11-15 00:00:00-06:00 0 0 0
2012-11-15 00:00:00.100000-06:00 0 0 0
2012-11-15 00:00:00.200000-06:00 0 0 0
2012-11-15 00:00:00.300000-06:00 0 0 0
2012-11-15 00:00:00.400000-06:00 0 0 0
2012-11-15 00:00:00.500000-06:00 0 0 0
In [97]: test2
Out[97]:
3 4 5
2012-11-15 00:00:00-06:00 0 0 0
2012-11-15 00:00:00.250000-06:00 0 0 0
2012-11-15 00:00:00.500000-06:00 0 0 0
In [98]: test1.join(test2, how="outer")
Out[98]:
0 1 2 3 4 5
2012-11-15 06:00:00-06:00 0 0 0 0 0 0
2012-11-15 06:00:00.100000-06:00 0 0 0 NaN NaN NaN
2012-11-15 06:00:00.200000-06:00 0 0 0 NaN NaN NaN
2012-11-15 06:00:00.250000-06:00 NaN NaN NaN 0 0 0
2012-11-15 06:00:00.300000-06:00 0 0 0 NaN NaN NaN
2012-11-15 06:00:00.400000-06:00 0 0 0 NaN NaN NaN
2012-11-15 06:00:00.500000-06:00 0 0 0 0 0 0