BUG: fix datetimeindex repr

doc/source/whatsnew/v2.1.0.rst

@@ -614,6 +614,7 @@ Metadata
 Other
 ^^^^^
 - Bug in :class:`DataFrame` and :class:`Series` raising for data of complex dtype when ``NaN`` values are present (:issue:`53627`)
+- Bug in :class:`DatetimeIndex` where ``repr`` of index passed with time does not print time is midnight and non-day based freq(:issue:`53470`)
 - Bug in :class:`FloatingArray.__contains__` with ``NaN`` item incorrectly returning ``False`` when ``NaN`` values are present (:issue:`52840`)
 - Bug in :func:`api.interchange.from_dataframe` when converting an empty DataFrame object (:issue:`53155`)
 - Bug in :func:`assert_almost_equal` now throwing assertion error for two unequal sets (:issue:`51727`)

pandas/core/indexes/datetimes.py

@@ -393,11 +393,19 @@ def _is_dates_only(self) -> bool:
  -------
  bool
  """
+ from pandas import Timedelta
+
  from pandas.io.formats.format import is_dates_only
 
+ delta = self.freq.delta if self.freq and hasattr(self.freq, "delta") else None
+
+ if delta and delta % Timedelta(days=1) != Timedelta(days=0):
+ return False
+
  # error: Argument 1 to "is_dates_only" has incompatible type
  # "Union[ExtensionArray, ndarray]"; expected "Union[ndarray,
  # DatetimeArray, Index, DatetimeIndex]"
+
  return self.tz is None and is_dates_only(self._values) # type: ignore[arg-type]
 
  def __reduce__(self):

pandas/tests/indexes/datetimes/test_formats.py

@@ -68,6 +68,30 @@ def test_dti_repr_short(self):
  dr = pd.date_range(start="1/1/2012", periods=3)
  repr(dr)
 
+ expected = (
+ "DatetimeIndex(['2012-01-01 00:00:00'], dtype='datetime64[ns]', freq='60T')"
+ )
+ dr = DatetimeIndex(["2012-01-01 00:00:00"], freq=str(60) + "T")
+ result = repr(dr)
+ assert expected == result
+
+ expected = (
+ "DatetimeIndex(['2012-01-01 00:00:00', '2012-01-01 01:00:00'], "
+ "dtype='datetime64[ns]', freq='60T')"
+ )
+ dr = DatetimeIndex(
+ ["2012-01-01 00:00:00", "2012-01-01 01:00:00"], freq=str(60) + "T"
+ )
+ result = repr(dr)
+ assert expected == result
+
+ expected = (
+ "DatetimeIndex(['2012-01-01 00:00:00'], dtype='datetime64[ns]', freq='36H')"
+ )
+ dr = DatetimeIndex(["2012-01-01 00:00:00"], freq=str(36) + "H")
+ result = repr(dr)
+ assert expected == result
+
  @pytest.mark.parametrize("method", ["__repr__", "__str__"])
  def test_dti_representation(self, method):
  idxs = []