diff --git a/application/libraries/Timezones.php b/application/libraries/Timezones.php
index 9df4a4c9..dc3986c1 100644
--- a/application/libraries/Timezones.php
+++ b/application/libraries/Timezones.php
@@ -312,7 +312,7 @@ class Timezones {
             'Europe/Bucharest' => 'Bucharest (+2:00)',
             'Europe/Chisinau' => 'Chisinau (+2:00)',
             'Europe/Helsinki' => 'Helsinki (+2:00)',
-            'Europe/Istanbul' => 'Istanbul (+2:00)',
+            'Europe/Istanbul' => 'Istanbul (+3:00)',
             'Europe/Kaliningrad' => 'Kaliningrad (+2:00)',
             'Europe/Kiev' => 'Kiev (+2:00)',
             'Europe/Mariehamn' => 'Mariehamn (+2:00)',
@@ -338,7 +338,7 @@ class Timezones {
             'Asia/Beirut' => 'Beirut (+2:00)',
             'Asia/Damascus' => 'Damascus (+2:00)',
             'Asia/Gaza' => 'Gaza (+2:00)',
-            'Asia/Istanbul' => 'Istanbul (+2:00)',
+            'Asia/Istanbul' => 'Istanbul (+3:00)',
             'Asia/Jerusalem' => 'Jerusalem (+2:00)',
             'Asia/Nicosia' => 'Nicosia (+2:00)',
             'Asia/Tel_Aviv' => 'Tel_Aviv (+2:00)',