Add missing timezone info in important places

Things like SQLAlchemy work correctly only for timezone-aware datetimes.
The returned TLObjects all have them, but those that are manually created
were missing them, so serializing the state into SQLAlchemy sessions failed.

telethon/client/auth.py

@@ -359,7 +359,7 @@ class AuthMethods(MessageParseMethods, UserMethods):
         # `catch_up` on all updates (and obtain necessary access hashes)
         # if they desire. The date parameter is ignored when pts = 1.
         self._state.pts = 1
-        self._state.date = datetime.datetime.now()
+        self._state.date = datetime.datetime.now(tz=datetime.timezone.utc)
 
         return user
 
@@ -417,7 +417,9 @@ class AuthMethods(MessageParseMethods, UserMethods):
         self._bot = None
         self._self_input_peer = None
         self._authorized = False
-        self._state = types.updates.State(0, 0, datetime.datetime.now(), 0, 0)
+        self._state = types.updates.State(
+            0, 0, datetime.datetime.now(tz=datetime.timezone.utc), 0, 0)
+
         self.disconnect()
         self.session.delete()
         return True

telethon/client/telegrambaseclient.py

@@ -4,7 +4,7 @@ import logging
 import platform
 import sys
 import time
-from datetime import datetime
+from datetime import datetime, timezone
 
 from .. import version, __name__ as __base_name__
 from ..crypto import rsa
@@ -296,8 +296,10 @@ class TelegramBaseClient(abc.ABC):
             self._dispatching_updates_queue = None
 
         self._authorized = None  # None = unknown, False = no, True = yes
-        self._state = (self.session.get_update_state(0)
-                       or types.updates.State(0, 0, datetime.now(), 0, 0))
+        self._state = self.session.get_update_state(0)
+        if not self._state:
+            self._state = types.updates.State(
+                0, 0, datetime.now(tz=timezone.utc), 0, 0)
 
         # Some further state for subclasses
         self._event_builders = []

telethon/tl/custom/draft.py

@@ -159,7 +159,7 @@ class Draft:
             self._raw_text = raw_text
             self.link_preview = link_preview
             self.reply_to_msg_id = reply_to
-            self.date = datetime.datetime.now()
+            self.date = datetime.datetime.now(tz=datetime.timezone.utc)
 
         return result