Fixing creation_time errors

db.py

@@ -59,7 +59,7 @@ def get_registration_code(code: str) -> Optional[RegistrationCode]:
 
 
 def add_registration_code(
-        expiration_time: datetime = datetime.now(),
+        expiration_time: datetime = None,
         max_usages: int = 1) -> RegistrationCode:
     code = RegistrationCode(
         uuid.uuid4().__str__(), expiration_time=expiration_time, max_usages=max_usages)

models.py

@@ -5,12 +5,12 @@ from typing import Tuple
 class RegistrationCode:
     def __init__(self,
                  code: str,
-                 creation_time: datetime = datetime.now(),
+                 creation_time: datetime = None,
                  expiration_time: datetime = None,
                  usages: int = 0,
                  max_usages: int = 1):
         self.code = code
-        self.creation_time = creation_time
+        self.creation_time = creation_time if creation_time is not None else datetime.now()
         self.expiration_time = expiration_time
         self.usages = usages
         self.max_usages = max_usages
@@ -37,10 +37,10 @@ class RegisteredUser:
     def __init__(self,
                  registration_code: str,
                  username: str,
-                 registered_time: datetime = datetime.now()):
+                 registered_time: datetime = None):
         self.registration_code = registration_code
         self.username = username
-        self.registered_time = registered_time
+        self.registered_time = registered_time if registered_time is not None else datetime.now()
 
     @staticmethod
     def from_db(db_registered_user: Tuple) -> 'RegisteredUser':