diff --git a/lib/nntp/tiny/session.py b/lib/nntp/tiny/session.py
index f76e510..08e4dc7 100644
--- a/lib/nntp/tiny/session.py
+++ b/lib/nntp/tiny/session.py
@@ -189,7 +189,7 @@ class Session():
 
     def _cmd_listgroup(self, *args):
         newsgroup = self.newsgroup
-        
+
         if len(args) == 0 and newsgroup is None:
             return self.respond(ResponseCode.NNTP_NEWSGROUP_NOT_SELECTED)
         elif len(args) > 0:
@@ -287,7 +287,7 @@ class Session():
     def _parse_date_time(self, datestr: str, timestr: str):
         yyyy, mm, dd = None, None, None,
         hh, MM, ss   = None, None, None
-        
+
         match = self.RE_DATE_SHORT.match(datestr)
         if match:
             yy, mm, dd = map(int, match[1:3])