Concat Series[datetimetz] & Series[category] loses timezone · Issue #23816 · pandas-dev/pandas (original) (raw)

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In [8]: a = pd.Series(pd.date_range('20170101', periods=4, tz='US/Pacific'))

In [9]: b = pd.Series(['a', 'b'], dtype='category')

In [10]: pd.concat([a, b], ignore_index=True)[0] Out[10]: Timestamp('2017-01-01 08:00:00')

Out[10] should have a tz like the following

In [11]: pd.concat([a, b.astype(object)], ignore_index=True)[0] Out[11]: Timestamp('2017-01-01 00:00:00-0800', tz='US/Pacific', freq='D')