Expected behavior for asi8 property?
Does asi8 always return int64 timestamps in UTC?

I have 2 dataframes : df with index in UTC and df2 with index in US/Eastern. The timezones are correctly interpreted but when I convert them to int64, I was a little surprised to find that both are identical. Is that intentional?  Thanks.

In [137]: df.index
Out[137]: 
<class 'pandas.tseries.index.DatetimeIndex'>
[2010-09-01 14:30:00.228000, ..., 2010-09-01 18:14:59.909000]
Length: 20604, Freq: None, Timezone: UTC

In [138]: df2.index
Out[138]: 
<class 'pandas.tseries.index.DatetimeIndex'>
[2010-09-01 10:30:00.228000, ..., 2010-09-01 14:14:59.909000]
Length: 20604, Freq: None, Timezone: US/Eastern

In [139]: df.index.asi8 == df2.index.asi8
Out[139]: array([ True,  True,  True, ...,  True,  True,  True], dtype=bool)

In [140]: np.all(df.index.asi8 == df2.index.asi8)
Out[140]: True
