From 37b165f8a2f6331300081d89747ff32fe6b3fce7 Mon Sep 17 00:00:00 2001
From: Alex Tselegidis <alextselegidis@gmail.com>
Date: Wed, 5 Oct 2022 12:09:57 +0300
Subject: [PATCH] Make sure the browser timezone is listed before preselecting
 it (otherwise use UTC)

---
 assets/js/pages/booking.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/assets/js/pages/booking.js b/assets/js/pages/booking.js
index 87f374be..0f97f2cd 100644
--- a/assets/js/pages/booking.js
+++ b/assets/js/pages/booking.js
@@ -150,7 +150,9 @@ App.Pages.Booking = (function () {
             }
         });
 
-        $selectTimezone.val(Intl.DateTimeFormat().resolvedOptions().timeZone || 'UTC');
+        const browserTimezone = Intl.DateTimeFormat().resolvedOptions().timeZone;
+        const isTimezoneSupported = $selectTimezone.find(`option[value="${browserTimezone}"]`).length > 0;
+        $selectTimezone.val(isTimezoneSupported ? browserTimezone : 'UTC');
 
         // Bind the event handlers (might not be necessary every time we use this class).
         addEventListeners();