BUG: to_datetime raising on invalid offsets with errors=coerce and infer_datetime_format

MarcoGorelli · MarcoGorelli · commit cf5bc0a1498d · 2022-09-21T09:29:13.000+01:00
diff --git a/doc/source/whatsnew/v1.6.0.rst b/doc/source/whatsnew/v1.6.0.rst
@@ -162,6 +162,7 @@ Categorical
 Datetimelike
 ^^^^^^^^^^^^
 - Bug in :func:`pandas.infer_freq`, raising ``TypeError`` when inferred on :class:`RangeIndex` (:issue:`47084`)
+- Bug in :func:`to_datetime` was raising on invalid offsets with ``errors='coerce'`` and ``infer_datetime_format=True`` (:issue:`48633`)
 -
 
 Timedelta
diff --git a/pandas/_libs/tslibs/parsing.pyx b/pandas/_libs/tslibs/parsing.pyx
@@ -943,7 +943,7 @@ def format_is_iso(f: str) -> bint:
     return False
 
 
-def guess_datetime_format(dt_str, bint dayfirst=False):
+def guess_datetime_format(dt_str: str, bint dayfirst=False) -> str | None:
     """
     Guess the datetime format of a given datetime string.
 

Original file line number	Diff line number	Diff line change
`@@ -162,6 +162,7 @@ Categorical`
`162`	`162`	`Datetimelike`
`163`	`163`	`^^^^^^^^^^^^`
`164`	`164`	- Bug in :func:`pandas.infer_freq`, raising ``TypeError`` when inferred on :class:`RangeIndex` (:issue:`47084`)
	`165`	+- Bug in :func:`to_datetime` was raising on invalid offsets with ``errors='coerce'`` and ``infer_datetime_format=True`` (:issue:`48633`)
`165`	`166`	`-`
`166`	`167`
`167`	`168`	`Timedelta`