Pass parsed date instead of entered text to the sync

boards/management/commands/sync_with_server.py

@@ -68,9 +68,14 b' class Command(BaseCommand):'
             if tags_str:
                 tags = tags_str.split(',')
 
+            timestamp_str = options.get('time_from')
+            timestamp = None
+            if timestamp_str:
+                timestamp = parse_datetime(timestamp_str)
+
             xml = SyncManager.generate_request_list(
                 opening_post=options.get('thread'), tags=tags,
-                timestamp_from=options.get('time_from')).encode()
+                timestamp_from=timestamp).encode()
             response, content = h.request(list_url, method="POST", body=xml)
             if response.status != 200:
                 raise Exception('Server returned error {}'.format(response.status))