Fix: added a check for invalid timezone

packages/core/src/layout/HomepageTimer/HomepageTimer.tsx

@@ -39,18 +39,28 @@ function getTimes(configApi: ConfigApi) {
 
   for (const clock of clockConfigs) {
     if (clock.has('label') && clock.has('timezone')) {
+      let label = clock.getString('label');
+
       const options = {
         timeZone: clock.getString('timezone'),
         ...timeFormat,
       };
 
-      const time = d.toLocaleTimeString(lang, options);
-      const label = clock.getString('label');
+      try {
+        new Date().toLocaleString(lang, options);
+      } catch (e) {
+        // eslint-disable-next-line no-console
+        console.warn(
+          `The timezone ${options.timeZone} is invalid. Defaulting to America/Los Angeles`,
+        );
+        options.timeZone = 'America/Los_Angeles';
+        label = 'Los Angeles';
+      }
 
+      const time = d.toLocaleTimeString(lang, options);
       clocks.push({ time, label });
     }
   }
-
   return clocks;
 }