BUG: to_sql no longer raises an AttributeError when saving an OBB date (#33140)

Co-authored-by: Matt Roeschke <[email protected]>

Author: mroeschke

doc/source/whatsnew/v1.1.0.rst

@@ -405,7 +405,7 @@ I/O
 - Bug in :meth:`read_csv` was causing a segfault when there were blank lines between the header and data rows (:issue:`28071`)
 - Bug in :meth:`read_csv` was raising a misleading exception on a permissions issue (:issue:`23784`)
 - Bug in :meth:`read_csv` was raising an ``IndexError`` when header=None and 2 extra data columns
-
+- Bug in :meth:`DataFrame.to_sql` where an ``AttributeError`` was raised when saving an out of bounds date (:issue:`26761`)
 
 Plotting
 ^^^^^^^^

pandas/io/sql.py

@@ -978,7 +978,8 @@ def _sqlalchemy_type(self, col):
                     return TIMESTAMP(timezone=True)
             except AttributeError:
                 # The column is actually a DatetimeIndex
-                if col.tz is not None:
+                # GH 26761 or an Index with date-like data e.g. 9999-01-01
+                if getattr(col, "tz", None) is not None:
                     return TIMESTAMP(timezone=True)
             return DateTime
         if col_type == "timedelta64":

pandas/tests/io/test_sql.py

@@ -1480,6 +1480,14 @@ def test_datetime_with_timezone_roundtrip(self):
             result["A"] = to_datetime(result["A"])
         tm.assert_frame_equal(result, expected)
 
+    def test_out_of_bounds_datetime(self):
+        # GH 26761
+        data = pd.DataFrame({"date": datetime(9999, 1, 1)}, index=[0])
+        data.to_sql("test_datetime_obb", self.conn, index=False)
+        result = sql.read_sql_table("test_datetime_obb", self.conn)
+        expected = pd.DataFrame([pd.NaT], columns=["date"])
+        tm.assert_frame_equal(result, expected)
+
     def test_naive_datetimeindex_roundtrip(self):
         # GH 23510
         # Ensure that a naive DatetimeIndex isn't converted to UTC