1 files changed, 4 insertions, 12 deletions
diff --git a/zoneinfo/Europe/Istanbul.ics b/zoneinfo/Europe/Istanbul.ics
index 603dfca6..42ca0741 100644
--- a/zoneinfo/Europe/Istanbul.ics
+++ b/zoneinfo/Europe/Istanbul.ics
@@ -2,21 +2,13 @@ BEGIN:VCALENDAR
 PRODID:-//citadel.org//NONSGML Citadel calendar//EN
 VERSION:2.0
 BEGIN:VTIMEZONE
-TZID:/citadel.org/20110819_3/Europe/Istanbul
+TZID:/citadel.org/20171021_4/Europe/Istanbul
 X-LIC-LOCATION:Europe/Istanbul
 BEGIN:STANDARD
 TZOFFSETFROM:+0300
-TZOFFSETTO:+0200
-TZNAME:EET
-DTSTART:19701025T040000
-RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
-END:STANDARD
-BEGIN:DAYLIGHT
-TZOFFSETFROM:+0200
 TZOFFSETTO:+0300
-TZNAME:EEST
-DTSTART:19700329T030000
-RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
-END:DAYLIGHT
+TZNAME:+03
+DTSTART:19700101T000000
+END:STANDARD
 END:VTIMEZONE
 END:VCALENDAR