refactor: creation_time and last_sign_in_time parsing

Author: exaby73

src/firebase_functions/private/_identity_fn.py

@@ -64,13 +64,14 @@ def _auth_user_info_from_token_data(token_data: dict[str, _typing.Any]):
 
 def _auth_user_metadata_from_token_data(token_data: dict[str, _typing.Any]):
     from firebase_functions.identity_fn import AuthUserMetadata
-    creation_time = int(token_data["creation_time"]) / 1000.0
+    creation_time = _dt.datetime.utcfromtimestamp(int(token_data["creation_time"]) / 1000.0)
     last_sign_in_time = None
     if "last_sign_in_time" in token_data:
-        last_sign_in_time = int(token_data["last_sign_in_time"]) / 1000.0
+        last_sign_in_time = _dt.datetime.utcfromtimestamp(int(token_data["last_sign_in_time"]) / 1000.0)
+
     return AuthUserMetadata(
-        creation_time=_dt.datetime.utcfromtimestamp(creation_time),
-        last_sign_in_time=_dt.datetime.utcfromtimestamp(last_sign_in_time) if last_sign_in_time else None,
+        creation_time=creation_time,
+        last_sign_in_time=last_sign_in_time
     )