diff --git a/telethon/client/telegrambaseclient.py b/telethon/client/telegrambaseclient.py
index 1393cfeb..1c52bb2f 100644
--- a/telethon/client/telegrambaseclient.py
+++ b/telethon/client/telegrambaseclient.py
@@ -543,7 +543,7 @@ class TelegramBaseClient(abc.ABC):
             for entity_id, state in await self.session.get_update_states():
                 if entity_id == 0:
                     # TODO current session doesn't store self-user info but adding that is breaking on downstream session impls
-                    ss = SessionState(0, 0, False, state.pts, state.qts, state.date, state.seq, None)
+                    ss = SessionState(0, 0, False, state.pts, state.qts, int(state.date.timestamp()), state.seq, None)
                 else:
                     cs.append(ChannelState(entity_id, state.pts))
 
diff --git a/telethon/sessions/sqlite.py b/telethon/sessions/sqlite.py
index 7f3c4e6d..963dbc0e 100644
--- a/telethon/sessions/sqlite.py
+++ b/telethon/sessions/sqlite.py
@@ -219,7 +219,13 @@ class SQLiteSession(MemorySession):
         c = self._cursor()
         try:
             rows = c.execute('select id, pts, qts, date, seq from update_state').fetchall()
-            return ((row[0], types.updates.State(*row[1:], unread_count=0)) for row in rows)
+            return ((row[0], types.updates.State(
+                pts=row[1],
+                qts=row[2],
+                date=datetime.datetime.fromtimestamp(row[3], tz=datetime.timezone.utc),
+                seq=row[4],
+                unread_count=0)
+            ) for row in rows)
         finally:
             c.close()