diff --git a/cqupt_ics/main.py b/cqupt_ics/main.py
index d564048..888a09a 100644
--- a/cqupt_ics/main.py
+++ b/cqupt_ics/main.py
@@ -20,19 +20,12 @@
 BEGIN:VTIMEZONE\r
 TZID:Asia/Shanghai\r
 BEGIN:STANDARD\r
-TZOFFSETFROM:+0900\r
+TZOFFSETFROM:+0800\r
 RRULE:FREQ=YEARLY;UNTIL=19910914T150000Z;BYMONTH=9;BYDAY=3SU\r
 DTSTART:19890917T000000\r
 TZNAME:GMT+8\r
 TZOFFSETTO:+0800\r
 END:STANDARD\r
-BEGIN:DAYLIGHT\r
-TZOFFSETFROM:+0800\r
-DTSTART:19910414T000000\r
-TZNAME:GMT+8\r
-TZOFFSETTO:+0900\r
-RDATE:19910414T000000\r
-END:DAYLIGHT\r
 END:VTIMEZONE\r
 """