1 files changed, 12 insertions, 4 deletions
diff --git a/zoneinfo/Asia/Tehran.ics b/zoneinfo/Asia/Tehran.ics
index ba86b920..f1d8ac63 100644
--- a/zoneinfo/Asia/Tehran.ics
+++ b/zoneinfo/Asia/Tehran.ics
@@ -2,13 +2,21 @@ BEGIN:VCALENDAR
 PRODID:-//citadel.org//NONSGML Citadel calendar//EN
 VERSION:2.0
 BEGIN:VTIMEZONE
-TZID:/citadel.org/20070227_1/Asia/Tehran
+TZID:/citadel.org/20171021_2/Asia/Tehran
 X-LIC-LOCATION:Asia/Tehran
-BEGIN:STANDARD
+BEGIN:DAYLIGHT
 TZOFFSETFROM:+0330
+TZOFFSETTO:+0430
+TZNAME:+0430
+DTSTART:19700321T000000
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=3SU
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:+0430
 TZOFFSETTO:+0330
-TZNAME:IRST
-DTSTART:19700101T000000
+TZNAME:+0330
+DTSTART:19700921T000000
+RRULE:FREQ=YEARLY;BYMONTH=9;BYDAY=3SU
 END:STANDARD
 END:VTIMEZONE
 END:VCALENDAR