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BUG: Add AM/PM token support on guess_datetime_format #53244

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BUG: Add AM/PM token support on guess_datetime_format #53244

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b7d1476
BUG: Add am/pm parsing support on guess_format
juli4nb4dillo May 15, 2023
a9c9734
:pick: add unit tests
juli4nb4dillo May 15, 2023
9fae954
more unit tests
juli4nb4dillo May 15, 2023
36f7d86
:pick: not guess am/pm mark
juli4nb4dillo May 16, 2023
554a136
Unit test and comments
juli4nb4dillo May 16, 2023
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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v2.1.0.rst
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Expand Up @@ -352,7 +352,7 @@ Conversion
- Bug in :meth:`DataFrame.__repr__` incorrectly raising a ``TypeError`` when the dtype of a column is ``np.record`` (:issue:`48526`)
- Bug in :meth:`DataFrame.info` raising ``ValueError`` when ``use_numba`` is set (:issue:`51922`)
- Bug in :meth:`DataFrame.insert` raising ``TypeError`` if ``loc`` is ``np.int64`` (:issue:`53193`)
-
- Bug in :meth:`datetimes._guess_datetime_format` if contains "AM" / "PM" tokens (:issue:`53147`)

Strings
^^^^^^^
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1 change: 0 additions & 1 deletion pandas/_libs/tslibs/parsing.pyx
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Expand Up @@ -908,7 +908,6 @@ def guess_datetime_format(dt_str: str, bint dayfirst=False) -> str | None:
(("tzinfo",), "%Z", 0),
(("day_of_week",), "%a", 0),
(("day_of_week",), "%A", 0),
(("meridiem",), "%p", 0),
]

if dayfirst:
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1 change: 1 addition & 0 deletions pandas/tests/tools/test_to_datetime.py
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Expand Up @@ -2942,6 +2942,7 @@ class TestDatetimeParsingWrappers:
("2005-11-09 10:15", datetime(2005, 11, 9, 10, 15)),
("2005-11-09 08H", datetime(2005, 11, 9, 8, 0)),
("2005/11/09 10:15", datetime(2005, 11, 9, 10, 15)),
("2005/11/09 10:15:32", datetime(2005, 11, 9, 10, 15, 32)),
("2005/11/09 08H", datetime(2005, 11, 9, 8, 0)),
("Thu Sep 25 10:36:28 2003", datetime(2003, 9, 25, 10, 36, 28)),
("Thu Sep 25 2003", datetime(2003, 9, 25)),
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6 changes: 4 additions & 2 deletions pandas/tests/tslibs/test_parsing.py
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Expand Up @@ -208,8 +208,10 @@ def test_parsers_month_freq(date_str, expected):
("2011-12-30T00:00:00.000000+9:0", "%Y-%m-%dT%H:%M:%S.%f%z"),
("2011-12-30T00:00:00.000000+09:", None),
("2011-12-30 00:00:00.000000", "%Y-%m-%d %H:%M:%S.%f"),
("Tue 24 Aug 2021 01:30:48 AM", "%a %d %b %Y %H:%M:%S %p"),
("Tuesday 24 Aug 2021 01:30:48 AM", "%A %d %b %Y %H:%M:%S %p"),
("Tue 24 Aug 2021 01:30:48", "%a %d %b %Y %H:%M:%S"),
("Tuesday 24 Aug 2021 01:30:48", "%A %d %b %Y %H:%M:%S"),
("Tue 24 Aug 2021 01:30:48 AM", None),
("Tuesday 24 Aug 2021 01:30:48 AM", None),
("27.03.2003 14:55:00.000", "%d.%m.%Y %H:%M:%S.%f"), # GH50317
],
)
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