Regression: date_range closed parameter not honoured in pandas 0.18.0

[PH82]

The behaviour of the method date_range appears to have changed between version 17 and 19. the below example changes the starting bound of the index returned?

print pd.date_range(start=datetime.datetime(2016,3,18,0,0), end=datetime.datetime(2016,3,22,0,0), freq='D', tz='UTC', closed='right')

pandas 0.17.0 Output
DatetimeIndex(['2016-03-19', '2016-03-20', '2016-03-21', '2016-03-22'], dtype='datetime64[ns, UTC]', freq='D')

pandas 0.18.0 Output
DatetimeIndex(['2016-03-18', '2016-03-19', '2016-03-20', '2016-03-21', '2016-03-22'],
dtype='datetime64[ns, UTC]', freq='D')

python: 2.7.11.final.0

[jreback]

this was originally this issue: #11804
and fixed here: #11806 and #12410

[jreback]

yeah this coerces to the basic data (i8) right before the closed detection which is incorrect.

pull-requests welcome!

[jreback]

cc @hcontrast
cc @thrasibule

[jreback]

right about here

[PH82]

Okay thanks, I'll keep an eye out for the fix.

[jreback]

@PH82 if you'd like to submit a patch would be helpful.