ENH: prohibit invalid kwargs being passed with a date string

Author: AlexKirko

pandas/_libs/tslibs/timestamps.pyx

@@ -1563,11 +1563,17 @@ class Timestamp(_Timestamp):
                         "hour" in kwargs or "minute" in kwargs or "second" in kwargs or
                         "microsecond" in kwargs):
                     raise ValueError("Cannot pass a date attribute keyword argument")
-                if isinstance(args[0], str) and "nanosecond" in kwargs:
-                    raise ValueError(
-                        "Cannot pass a date attribute keyword "
-                        "argument when passing a date string; 'tz' is keyword-only"
-                    )
+                if isinstance(args[0], str):
+                    if "nanosecond" in kwargs:
+                        raise ValueError(
+                            "Cannot pass a date attribute keyword "
+                            "argument when passing a date string; 'tz' is keyword-only"
+                        )
+                    if any(k not in ["tz", "tzinfo", "unit"] for k in kwargs.keys()):
+                        raise ValueError(
+                            "When passing a date string "
+                            "can only pass unit and tz or tzinfo as a keyword argument."
+                        )
 
             ts_input = args[0]
             tzinfo = kwargs.get("tzinfo")

pandas/tests/scalar/timestamp/test_constructors.py

@@ -898,3 +898,14 @@ def test_timestamp_constructor_arg_shift():
     result = Timestamp(2019, 10, 27, minute=30)
     expected = Timestamp(2019, 10, 27, 0, 30)
     assert result == expected
+
+
+def test_timestamp_constructor_str_invalid_kwargs():
+    # Check that we didn't pass anything except
+    # tz, tzinfo, unit with a string
+    msg = (
+        "When passing a date string "
+        "can only pass unit and tz or tzinfo as a keyword argument."
+    )
+    with pytest.raises(ValueError, match=msg):
+        Timestamp("2020-01-01", foo="bar")