REF: dispatch DatetimeBlock.to_native_types to DTA._format_native_types

pandas/core/arrays/datetimes.py

@@ -613,8 +613,8 @@ def _format_native_types(self, na_rep="NaT", date_format=None, **kwargs):
         fmt = _get_format_datetime64_from_values(self, date_format)
 
         return tslib.format_array_from_datetime(
-            self.asi8, tz=self.tz, format=fmt, na_rep=na_rep
-        )
+            self.asi8.ravel(), tz=self.tz, format=fmt, na_rep=na_rep
+        ).reshape(self.shape)
 
     # -----------------------------------------------------------------
     # Comparison Methods

pandas/core/internals/blocks.py

@@ -6,7 +6,7 @@
 
 import numpy as np
 
-from pandas._libs import NaT, Timestamp, algos as libalgos, lib, tslib, writers
+from pandas._libs import NaT, Timestamp, algos as libalgos, lib, writers
 import pandas._libs.internals as libinternals
 from pandas._libs.tslibs import Timedelta, conversion
 from pandas._libs.tslibs.timezones import tz_compare
@@ -2116,21 +2116,13 @@ def _can_hold_element(self, element: Any) -> bool:
 
         return is_valid_nat_for_dtype(element, self.dtype)
 
-    def to_native_types(self, na_rep=None, date_format=None, quoting=None, **kwargs):
-        """ convert to our native types format, slicing if desired """
-        values = self.values
-        i8values = self.values.view("i8")
-
-        from pandas.io.formats.format import _get_format_datetime64_from_values
-
-        fmt = _get_format_datetime64_from_values(values, date_format)
+    def to_native_types(self, na_rep="NaT", date_format=None, **kwargs):
+        """ convert to our native types format """
+        dta = self.array_values()
 
-        result = tslib.format_array_from_datetime(
-            i8values.ravel(),
-            tz=getattr(self.values, "tz", None),
-            format=fmt,
-            na_rep=na_rep,
-        ).reshape(i8values.shape)
+        result = dta._format_native_types(
+            na_rep=na_rep, date_format=date_format, **kwargs
+        )
         return np.atleast_2d(result)
 
     def set(self, locs, values):

pandas/io/formats/format.py

@@ -1547,7 +1547,7 @@ def _is_dates_only(
     values: Union[np.ndarray, DatetimeArray, Index, DatetimeIndex]
 ) -> bool:
     # return a boolean if we are only dates (and don't have a timezone)
-    assert values.ndim == 1
+    values = values.ravel()
 
     values = DatetimeIndex(values)
     if values.tz is not None: