hey, many formats are now guessable!

Author: MarcoGorelli

pandas/tests/tslibs/test_parsing.py

@@ -154,27 +154,25 @@ def test_parsers_month_freq(date_str, expected):
         ("2011-12-30T00:00:00", "%Y-%m-%dT%H:%M:%S"),
         ("2011-12-30T00:00:00UTC", "%Y-%m-%dT%H:%M:%S%Z"),
         ("2011-12-30T00:00:00Z", "%Y-%m-%dT%H:%M:%S%z"),
-        # The +9 format for offsets is supported by dateutil,
-        # but don't round-trip, see https://github.com/pandas-dev/pandas/issues/48921
-        ("2011-12-30T00:00:00+9", None),
-        ("2011-12-30T00:00:00+09", None),
+        ("2011-12-30T00:00:00+9", "%Y-%m-%dT%H:%M:%S%z"),
+        ("2011-12-30T00:00:00+09", "%Y-%m-%dT%H:%M:%S%z"),
         ("2011-12-30T00:00:00+090", None),
         ("2011-12-30T00:00:00+0900", "%Y-%m-%dT%H:%M:%S%z"),
         ("2011-12-30T00:00:00-0900", "%Y-%m-%dT%H:%M:%S%z"),
         ("2011-12-30T00:00:00+09:00", "%Y-%m-%dT%H:%M:%S%z"),
         ("2011-12-30T00:00:00+09:000", None),
-        ("2011-12-30T00:00:00+9:0", None),
+        ("2011-12-30T00:00:00+9:0", "%Y-%m-%dT%H:%M:%S%z"),
         ("2011-12-30T00:00:00+09:", None),
         ("2011-12-30T00:00:00.000000UTC", "%Y-%m-%dT%H:%M:%S.%f%Z"),
         ("2011-12-30T00:00:00.000000Z", "%Y-%m-%dT%H:%M:%S.%f%z"),
-        ("2011-12-30T00:00:00.000000+9", None),
-        ("2011-12-30T00:00:00.000000+09", None),
+        ("2011-12-30T00:00:00.000000+9", "%Y-%m-%dT%H:%M:%S.%f%z"),
+        ("2011-12-30T00:00:00.000000+09", "%Y-%m-%dT%H:%M:%S.%f%z"),
         ("2011-12-30T00:00:00.000000+090", None),
         ("2011-12-30T00:00:00.000000+0900", "%Y-%m-%dT%H:%M:%S.%f%z"),
         ("2011-12-30T00:00:00.000000-0900", "%Y-%m-%dT%H:%M:%S.%f%z"),
         ("2011-12-30T00:00:00.000000+09:00", "%Y-%m-%dT%H:%M:%S.%f%z"),
         ("2011-12-30T00:00:00.000000+09:000", None),
-        ("2011-12-30T00:00:00.000000+9:0", None),
+        ("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"),
@@ -299,7 +297,7 @@ def test_parse_time_string_check_instance_type_raise_exception():
         ("%Y-%m-%dT%H:%M:%S.%f", True),
         ("%Y-%m-%dT%H:%M:%S.%f%z", True),
         ("%Y-%m-%dT%H:%M:%S.%f%Z", False),
-        ("%Y%m%d", False),
+        ("%Y%m%d", True),
         ("%Y%m", False),
         ("%Y", False),
         ("%Y-%m-%d", True),