Merge branch 'main' into bug/is_year_start

doc/source/whatsnew/v3.0.0.rst

@@ -359,6 +359,8 @@ Datetimelike
 - Bug in :class:`Timestamp` constructor failing to raise when ``tz=None`` is explicitly specified in conjunction with timezone-aware ``tzinfo`` or data (:issue:`48688`)
 - Bug in :func:`date_range` where the last valid timestamp would sometimes not be produced (:issue:`56134`)
 - Bug in :meth:`is_year_start` where a DateTimeIndex constructed via a date_range with frequency 'MS' wouldn't have the correct year or quarter start attributes (:issue:`57377`)
+- Bug in :func:`date_range` where using a negative frequency value would not include all points between the start and end values (:issue:`56382`)
+- Bug in :func:`tseries.api.guess_datetime_format` would fail to infer time format when "%Y" == "%H%M" (:issue:`57452`)
 
 Timedelta
 ^^^^^^^^^