Squashed commit of the following:

commit 22dc77c0290ac7dd0e4ad91264d07fa5833ac6ba
Author: Kalista Payne <sabe@habitica.com>
Date:   Tue Sep 17 20:34:00 2024 -0500

    fix(event): remove UTC wording

commit c72b5dbbee80c7da9839f57102ab45ff3e42b8f7
Author: Kalista Payne <sabe@habitica.com>
Date:   Tue Sep 17 20:23:49 2024 -0500

    fix(sale): use native JS for showing tz info

website/client/src/components/payments/buyGemsModal.vue

@@ -183,11 +183,10 @@
               eventStartMonth: eventInfo.startMonth,
               eventStartOrdinal: eventInfo.startOrdinal,
               eventStartTime: eventInfo.startTime,
-              eventStartUTC: eventInfo.startUTC,
               eventEndMonth: eventInfo.endMonth,
               eventEndOrdinal: eventInfo.endOrdinal,
               eventEndTime: eventInfo.endTime,
-              eventEndUTC: eventInfo.endUTC,
+              timeZone: eventInfo.timeZoneAbbrev,
             }) }}
           </small>
         </div>
@@ -445,19 +444,24 @@ export default {
       );
       if (!currentEvent) return null;
 
+      // https://stackoverflow.com/questions/1954397/detect-timezone-abbreviation-using-javascript#answer-66180857
+      const timeZoneAbbrev = new Intl.DateTimeFormat('en-us', { timeZoneName: 'short' })
+        .formatToParts(new Date())
+        .find(part => part.type === 'timeZoneName')
+        .value;
+
       return {
         name: currentEvent.event,
         class: currentEvent.gemsPromo ? `event-${currentEvent.event}` : '',
         gemsPromo: currentEvent.gemsPromo,
         promo: currentEvent.promo,
+        timeZoneAbbrev,
         startMonth: moment(currentEvent.start).format('MMMM'),
         startOrdinal: moment(currentEvent.start).format('Do'),
         startTime: moment(currentEvent.start).format('hh:mm A'),
-        startUTC: moment(currentEvent.start).utc().format('hh:mm A'),
         endMonth: moment(currentEvent.end).format('MMMM'),
         endOrdinal: moment(currentEvent.end).format('Do'),
         endTime: moment(currentEvent.end).format('hh:mm A'),
-        endUTC: moment(currentEvent.end).utc().format('hh:mm A'),
       };
     },
     isGemsPromoActive () {