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TST: Add regression tests for concat with non-ns DatetimeIndex units (GH#58471)

DatetimeDatetime data dtypeDatetime data dtype

Needs TestsUnit test(s) needed to prevent regressionsUnit test(s) needed to prevent regressions

ReshapingConcat, Merge/Join, Stack/Unstack, ExplodeConcat, Merge/Join, Stack/Unstack, Explode

Status: Open (in progress).

pandas-dev/pandasnumber 62304

#62304 In pandas-dev/pandas;

· skalwaghe-56 opened on Sep 9, 2025

API: indexing dates-with-datetime64

Bug

DatetimeDatetime data dtypeDatetime data dtype

datetime.datestdlib datetime.date supportstdlib datetime.date support

IndexRelated to the Index class or subclassesRelated to the Index class or subclasses

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

Status: Open.

#62158 In pandas-dev/pandas;

· jbrockmendel opened on Aug 20, 2025

API: timestamp resolution inference: default to microseconds when possible

DatetimeDatetime data dtypeDatetime data dtype

Non-Nanodatetime64/timedelta64 with non-nanosecond resolutiondatetime64/timedelta64 with non-nanosecond resolution

Stale

Timestamppd.Timestamp and associated methodspd.Timestamp and associated methods

Status: Draft (not ready).

pandas-dev/pandasnumber 62031

#62031 In pandas-dev/pandas;

· jorisvandenbossche opened on Aug 3, 2025

BUG: union of MultiIndex throws exception for datetime and pd.Timestamp with identical values

Bug

DatetimeDatetime data dtypeDatetime data dtype

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

IndexRelated to the Index class or subclassesRelated to the Index class or subclasses

Status: Open.

#61807 In pandas-dev/pandas;

· jwg4 opened on Jul 7, 2025

BUG: Errors using pyarrow datetime types on windows

Arrowpyarrow functionalitypyarrow functionality

Bug

DatetimeDatetime data dtypeDatetime data dtype

Docs

Upstream issueIssue related to pandas dependencyIssue related to pandas dependency

WindowsWindows OSWindows OS

Status: Open.

#61782 In pandas-dev/pandas;

· Liam3851 opened on Jul 5, 2025

BUG: np.nan to datetime assertionerror when too large datetime given

Bug

DatetimeDatetime data dtypeDatetime data dtype

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Status: Open.

#61671 In pandas-dev/pandas;

· dnallicus opened on Jun 16, 2025

BUG: date_range behaviour is inconsistent when using inclusive=right

Bug

DatetimeDatetime data dtypeDatetime data dtype

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Status: Open.

#61483 In pandas-dev/pandas;

· sebastian-east opened on May 23, 2025

BUG: Slower <code>DataFrame.plot</code> with <code>DatetimeIndex</code>

DatetimeDatetime data dtypeDatetime data dtype

PerformanceMemory or execution speed performanceMemory or execution speed performance

Visualizationplottingplotting

Status: Open.

#61398 In pandas-dev/pandas;

· Abdelgha-4 opened on May 6, 2025

BUG: inserting list of strings into Series auto-infers them as datetimes with mixed formats

Bug

DatetimeDatetime data dtypeDatetime data dtype

Status: Open.

#61353 In pandas-dev/pandas;

· MarcoGorelli opened on Apr 25, 2025

BUG: Inconsistency when converting week PeriodIndex into DatetimeIndex with astype("datetime64[ns]")

Bug

DatetimeDatetime data dtypeDatetime data dtype

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

PeriodPeriod data typePeriod data type

Status: Open.

#61177 In pandas-dev/pandas;

· dbalabka opened on Mar 25, 2025

BUG: Collision between equivalent frequencies 'QS-FEB' and 'QS-NOV'

Bug

DatetimeDatetime data dtypeDatetime data dtype

FrequencyDateOffsetsDateOffsets

Status: Open.

#61086 In pandas-dev/pandas;

· rwijtvliet opened on Mar 8, 2025

BUG: datetime64 column type fails parquet round trip

Bug

DatetimeDatetime data dtypeDatetime data dtype

IO Parquetparquet, featherparquet, feather

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Upstream issueIssue related to pandas dependencyIssue related to pandas dependency

Status: Open.

#60774 In pandas-dev/pandas;

· bmwilly opened on Jan 23, 2025