Make created_at utc in topic writer

ydb/_topic_reader/topic_reader_asyncio_test.py

@@ -748,7 +748,7 @@ async def test_free_buffer_after_partition_stop(self, stream, stream_reader, par
         initial_buffer_size = stream_reader._buffer_size_bytes
         message_size = initial_buffer_size - 1
 
-        t = datetime.datetime.now()
+        t = datetime.datetime.now(datetime.timezone.utc)
 
         stream.from_server.put_nowait(
             StreamReadMessage.FromServer(

ydb/_topic_writer/topic_writer_asyncio.py

@@ -307,7 +307,7 @@ def _add_messages_to_send_queue(self, internal_messages: List[InternalMessage]):
 
     def _prepare_internal_messages(self, messages: List[PublicMessage]) -> List[InternalMessage]:
         if self._settings.auto_created_at:
-            now = datetime.datetime.now()
+            now = datetime.datetime.now(datetime.timezone.utc)
         else:
             now = None
 

ydb/_topic_writer/topic_writer_asyncio_test.py

@@ -132,7 +132,7 @@ async def test_init_writer(self, stream):
 
     async def test_write_a_message(self, writer_and_stream: WriterWithMockedStream):
         data = "123".encode()
-        now = datetime.datetime.now()
+        now = datetime.datetime.now(datetime.timezone.utc)
         writer_and_stream.writer.write(
             [
                 InternalMessage(
@@ -322,7 +322,7 @@ async def test_reconnect_and_resent_non_acked_messages_on_retriable_error(
         get_stream_writer,
         default_write_statistic,
     ):
-        now = datetime.datetime.now()
+        now = datetime.datetime.now(datetime.timezone.utc)
         data = "123".encode()
 
         message1 = PublicMessage(
@@ -460,7 +460,7 @@ async def test_deny_double_seqno(self, reconnector: WriterAsyncIOReconnector, ge
 
     @freezegun.freeze_time("2022-01-13 20:50:00", tz_offset=0)
     async def test_auto_created_at(self, default_driver, default_settings, get_stream_writer):
-        now = datetime.datetime.now()
+        now = datetime.datetime.now(datetime.timezone.utc)
 
         settings = copy.deepcopy(default_settings)
         settings.auto_created_at = True
@@ -587,7 +587,7 @@ async def test_custom_encoder(self, default_driver, default_settings, get_stream
         settings.codec = codec
         reconnector = WriterAsyncIOReconnector(default_driver, settings)
 
-        now = datetime.datetime.now()
+        now = datetime.datetime.now(datetime.timezone.utc)
         seqno = self.init_last_seqno + 1
 
         await reconnector.write_with_ack_future([PublicMessage(data=b"123", seqno=seqno, created_at=now)])