weekofyear gives different results on a DatetimeIndex (if tz is given)

[sdementen]

Hello,

The following code

dates = ["2013/12/29", "2013/12/30", "2013/12/31"]
dates = pandas.DatetimeIndex(dates, tz="Europe/Brussels")
print dates.weekofyear
print [d.weekofyear for d in dates]

gives

[52  1  1]
[52, 52, 1]

i.e. calling weekofyear on the datetimeindex directly or iterating on the different dates of the datetimeindex gives different results.

Notice that if we remove the tz in the DatetimeIndex, the results are consistant.

Sébastien

[jreback]

seems some kind of bug in the cython-code. want to dig in?
(and no real tests of this in any event)
https://github.com/pydata/pandas/blob/master/pandas/tslib.pyx#L2212

this takes input of the UTC i8 representation (e.g. the nanoseconds from epoch), like Timestamp(....).value) but as an array of dtype 'i8'