diff --git a/app/javascript/dashboard/routes/dashboard/settings/inbox/helpers/timezones.json b/app/javascript/dashboard/routes/dashboard/settings/inbox/helpers/timezones.json
index b238add21..810415ffb 100644
--- a/app/javascript/dashboard/routes/dashboard/settings/inbox/helpers/timezones.json
+++ b/app/javascript/dashboard/routes/dashboard/settings/inbox/helpers/timezones.json
@@ -86,7 +86,7 @@
   "Riyadh (GMT+03:00)": "Asia/Riyadh",
   "Nairobi (GMT+03:00)": "Africa/Nairobi",
   "Baghdad (GMT+03:00)": "Asia/Baghdad",
-  "Tehran (GMT+04:30)": "Asia/Tehran",
+  "Tehran (GMT+03:30)": "Asia/Tehran",
   "Abu Dhabi (GMT+04:00)": "Asia/Muscat",
   "Muscat (GMT+04:00)": "Asia/Muscat",
   "Baku (GMT+04:00)": "Asia/Baku",