Further improve previous fix

If the stored value is a float, then we should not change it. Only convert to a timestamp if the stored value was read as a datetime.datetime object

unmanic/libs/session.py

@@ -30,9 +30,11 @@
 
 """
 import base64
+import datetime
 import pickle
 import random
 import time
+
 import requests
 
 from unmanic import config
@@ -163,8 +165,7 @@ def __update_created_timestamp(self):
         #   together to register if the site goes down
         self.created = (seconds + seconds_offset)
         # Print only the accurate update time in debug log
-        from datetime import datetime
-        created = datetime.fromtimestamp(seconds)
+        created = datetime.datetime.fromtimestamp(seconds)
         self.logger.debug('Updated session at %s', str(created))
 
     def __fetch_installation_data(self):
@@ -189,7 +190,9 @@ def __fetch_installation_data(self):
         self.picture_uri = str(current_installation.picture_uri)
         self.name = str(current_installation.name)
         self.email = str(current_installation.email)
-        self.created = current_installation.created.timestamp() if current_installation.created else None
+        self.created = current_installation.created if current_installation.created else None
+        if isinstance(self.created, datetime.datetime):
+            self.created = self.created.timestamp()
 
         self.__update_session_auth(access_token=current_installation.user_access_token,
                                    session_cookies=current_installation.session_cookies)