first version finished

django/utils/datetime_safe.pyi

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+from datetime import (
+    date,
+    datetime,
+)
+from typing import (
+    List,
+    Union,
+)
+
+
+def _findall(text: str, substr: str) -> List[int]: ...
+
+
+def new_date(d: date) -> date: ...
+
+
+def new_datetime(d: datetime) -> datetime: ...
+
+
+def strftime(dt: Union[date, datetime], fmt: str) -> str: ...
+
+
+class date:
+    def strftime(self, fmt: str) -> str: ...
+
+
+class datetime:
+    def strftime(self, fmt: str) -> str: ...