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BUG: DatetimeIndex.is_year_start and DatetimeIndex.is_quarter_start always return False on double-digit frequencies (#58549)
* correct def get_start_end_field, add test, add a note to v3.0.0
* replace regex with to_offset
* replace offset.freqstr.replace with offset.name
* move to_offset from get_start_end_field up
* fixup test_is_yqm_start_end
* rename the argument freqstr in get_start_end_field
* rename the variable freqstr in _field_accessor
* simplify to_offset(freq.freqstr).name
* rename the variable freqstr
Copy file name to clipboardExpand all lines: doc/source/whatsnew/v3.0.0.rst
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@@ -421,6 +421,7 @@ Interval
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Indexing
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^^^^^^^^
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- Bug in :meth:`DataFrame.__getitem__` returning modified columns when called with ``slice`` in Python 3.12 (:issue:`57500`)
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- Bug in :meth:`DatetimeIndex.is_year_start` and :meth:`DatetimeIndex.is_quarter_start` returning ``False`` on double-digit frequencies (:issue:`58523`)
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