ENH Add normalize method to Series dt accessor.

Author: hayd

doc/source/whatsnew/v0.16.1.txt

@@ -68,6 +68,7 @@ Enhancements
 - Allow ``Categorical.add_categories`` to accept ``Series`` or ``np.array``. (:issue:`9927`)
 
 - Add/delete ``str/dt/cat`` accessors dynamically from ``__dir__``. (:issue:`9910`)
+- Add ``normalize`` as a ``dt`` accessor method.
 
 - ``DataFrame`` and ``Series`` now have ``_constructor_expanddim`` property as overridable constructor for one higher dimensionality data. This should be used only when it is really needed, see :ref:`here <ref-subclassing-pandas>`
 

pandas/tests/test_series.py

@@ -83,7 +83,7 @@ def test_dt_namespace_accessor(self):
         ok_for_period = ok_for_base + ['qyear']
         ok_for_dt = ok_for_base + ['date','time','microsecond','nanosecond', 'is_month_start', 'is_month_end', 'is_quarter_start',
                                    'is_quarter_end', 'is_year_start', 'is_year_end', 'tz']
-        ok_for_dt_methods = ['to_period','to_pydatetime','tz_localize','tz_convert']
+        ok_for_dt_methods = ['to_period','to_pydatetime','tz_localize','tz_convert', 'normalize']
         ok_for_td = ['days','seconds','microseconds','nanoseconds']
         ok_for_td_methods = ['components','to_pytimedelta']
 
@@ -165,6 +165,7 @@ def compare(s, name):
         tm.assert_series_equal(s.dt.year,Series(np.array([2014,2014,2014],dtype='int64'),index=index))
         tm.assert_series_equal(s.dt.month,Series(np.array([2,2,2],dtype='int64'),index=index))
         tm.assert_series_equal(s.dt.second,Series(np.array([0,1,2],dtype='int64'),index=index))
+        tm.assert_series_equal(s.dt.normalize(), pd.Series([s[0]] * 3, index=index))
 
         # periodindex
         for s in [Series(period_range('20130101',periods=5,freq='D'))]:

pandas/tseries/common.py

@@ -125,7 +125,7 @@ def to_pydatetime(self):
                                            accessors=DatetimeIndex._datetimelike_ops,
                                            typ='property')
 DatetimeProperties._add_delegate_accessors(delegate=DatetimeIndex,
-                                           accessors=["to_period","tz_localize","tz_convert"],
+                                           accessors=["to_period","tz_localize","tz_convert","normalize"],
                                            typ='method')
 
 class TimedeltaProperties(Properties):