Upgraded next and prisma. Replaced moment-timezone.

src/lib/date.ts

@@ -1,4 +1,3 @@
-import moment from 'moment-timezone';
 import {
   addMinutes,
   addHours,
@@ -105,8 +104,17 @@ const DATE_FUNCTIONS = {
   },
 };
 
+export function isValidTimezone(timezone: string) {
+  try {
+    Intl.DateTimeFormat(undefined, { timeZone: timezone });
+    return true;
+  } catch (error) {
+    return false;
+  }
+}
+
 export function getTimezone() {
-  return moment.tz.guess();
+  return Intl.DateTimeFormat().resolvedOptions().timeZone;
 }
 
 export function parseDateValue(value: string) {