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FIX: DatetimeIndex.array should return DatetimeArray instead of ExtensionArray #1373

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Merged
merged 2 commits into from
Sep 18, 2025
Merged

FIX: DatetimeIndex.array should return DatetimeArray instead of ExtensionArray #1373

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41f7f80
FIX: DatetimeIndex.array should return DatetimeArray instead of Exten…
gamal1osama Sep 17, 2025
63a966f
Fix test formatting and following project development work flow
gamal1osama Sep 17, 2025
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6 changes: 6 additions & 0 deletions pandas-stubs/core/indexes/datetimes.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ from pandas import (
TimedeltaIndex,
Timestamp,
)
from pandas.core.arrays import DatetimeArray
from pandas.core.indexes.accessors import DatetimeIndexProperties
from pandas.core.indexes.datetimelike import DatetimeTimedeltaMixin
from pandas.core.series import (
Expand Down Expand Up @@ -61,6 +62,11 @@ class DatetimeIndex(
name: Hashable = ...,
) -> Self: ...
def __reduce__(self): ...

# Override the array property to return DatetimeArray instead of ExtensionArray
@property
def array(self) -> DatetimeArray: ...

# various ignores needed for mypy, as we do want to restrict what can be used in
# arithmetic for these types
@overload # type: ignore[override]
Expand Down
12 changes: 12 additions & 0 deletions tests/indexes/test_indexes.py
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Expand Up @@ -12,6 +12,7 @@
import numpy as np
from numpy import typing as npt
import pandas as pd
from pandas.core.arrays import DatetimeArray
from pandas.core.arrays.categorical import Categorical
from pandas.core.indexes.base import Index
from typing_extensions import (
Expand Down Expand Up @@ -1516,3 +1517,14 @@ def test_period_index_asof_locs() -> None:
assert_type(idx.asof_locs(where, mask), np_1darray[np.intp]),
np_1darray[np.intp],
)


def test_datetime_index_array_property() -> None:
"""Test that DatetimeIndex.array returns DatetimeArray instead of ExtensionArray."""
# Test with pd.to_datetime().array - this is the main issue reported
arr = pd.to_datetime(["2020-01-01", "2020-01-02"]).array
check(assert_type(arr, DatetimeArray), DatetimeArray)

# Test with DatetimeIndex constructor directly
dt_index = pd.DatetimeIndex(["2020-01-01", "2020-01-02"])
check(assert_type(dt_index.array, DatetimeArray), DatetimeArray)
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