Fix missed mypy error

Author: wwkimball

tests/test_common_parsers.py

@@ -312,6 +312,11 @@ def test_jsonify_datetime_value(self):
         jdata = Parsers.jsonify_yaml_data(cdata)
         assert jdata == "2021-01-13T01:02:03"
 
+    def test_jsonify_datetime_value_date_only(self):
+        cdata = dt.datetime(2021, 1, 13, 0, 0, 0)
+        jdata = Parsers.jsonify_yaml_data(cdata)
+        assert jdata == "2021-01-13"
+
     def test_jsonify_commented_map_with_merge_tuple(self):
         yaml = Parsers.get_yaml_editor()
         cdata = yaml.load("""

yamlpath/common/parsers.py

@@ -396,11 +396,11 @@ def _jsonify_datetime_value(
             and data.microsecond == 0
             and getattr(data, "tzinfo", None) is None
         )
-        return (
-            data.date().isoformat()
-            if is_date_only
-            else Nodes.get_timestamp_with_tzinfo(data).isoformat()
-        )
+        if is_date_only:
+            return data.date().isoformat()
+
+        tsdata = Nodes.get_timestamp_with_tzinfo(data)
+        return str(tsdata.isoformat())
 
     @staticmethod
     def _jsonify_seq_values(data: Any) -> Any: