diff --git a/happening.py b/happening.py
index 6b24bd1f8..96725ea3f 100644
--- a/happening.py
+++ b/happening.py
@@ -369,8 +369,8 @@ def _icalendar_day(base_dir: str, nickname: str, domain: str,
         event_end = \
             _ical_date_string(event_end.strftime("%Y-%m-%dT%H:%M:%SZ"))
 
-        token_year = int(event_start.split('-')[0])
-        token_month_number = int(event_start.split('-')[1])
+        token_year = int(event_start[4:])
+        token_month_number = int(event_starttimestamp[4:][:2])
         uid = _dav_encode_token(token_year, token_month_number, post_id)
 
         ical_str += \