Parser Token Validation (#1007)

arrow/parser.py

@@ -574,9 +574,12 @@ def _parse_token(
         elif token in ["a", "A"]:
             if value in (self.locale.meridians["am"], self.locale.meridians["AM"]):
                 parts["am_pm"] = "am"
+                if "hour" in parts and not 0 <= parts["hour"] <= 12:
+                    raise ParserMatchError(
+                        f"Hour token value must be between 0 and 12 inclusive for token {token!r}."
+                    )
             elif value in (self.locale.meridians["pm"], self.locale.meridians["PM"]):
                 parts["am_pm"] = "pm"
-
         elif token == "W":
             parts["weekdate"] = value
 

tests/test_parser.py

@@ -210,6 +210,11 @@ def test_parse_numbers(self):
             == self.expected
         )
 
+    def test_parse_am(self):
+
+        with pytest.raises(ParserMatchError):
+            self.parser.parse("2021-01-30 14:00:00 AM", "YYYY-MM-DD HH:mm:ss A")
+
     def test_parse_year_two_digit(self):
 
         self.expected = datetime(1979, 1, 1, 12, 5, 10)