Creating DatetimeIndex from timezone-aware datetimes shifts the times

[ijmcf]

Creating a DatetimeIndex from a list of timezone-aware datetimes shift the times according to the offset of the timezone.

Using an easy way to get a list of datetimes by creating a DatetimeIndex and casting it to a list:
dr = pandas.date_range('2012-06-02', periods=10, tz=pytz.timezone('US/Eastern'))

<class 'pandas.tseries.index.DatetimeIndex'>
[2012-06-02 00:00:00, ..., 2012-06-11 00:00:00]
Length: 10, Freq: D, Timezone: US/Eastern

pandas.DatetimeIndex(list(a))

<class 'pandas.tseries.index.DatetimeIndex'>
[2012-06-02 04:00:00, ..., 2012-06-11 04:00:00]
Length: 10, Freq: None, Timezone: US/Eastern