fix: Send event startsAt and endsAt time in event timezone (#3633)

* fix: Send event startsAt and endsAt time in event timezone

* Handle cases for other models

* Remove duplication

Author: prateekj117

app/utils/computed-helpers.js

@@ -47,13 +47,23 @@ export const computedSegmentedLink = function(property) {
 export const computedDateTimeSplit = function(property, segmentFormat, endProperty) {
   return computed(property, {
     get() {
-      return moment(this.get(property)).format(getFormat(segmentFormat));
+      let momentDate = moment(this.get(property));
+      if (this.constructor.modelName === 'event') {
+        momentDate = momentDate.tz(this.timezone);
+      }
+      return momentDate.format(getFormat(segmentFormat));
     },
     set(key, value) {
-      const newDate = moment(value, getFormat(segmentFormat));
+      let newDate = moment(value, getFormat(segmentFormat));
+      if (this.constructor.modelName === 'event') {
+        newDate = newDate.tz(this.timezone, true);
+      }
       let oldDate = newDate;
       if (this.get(property)) {
         oldDate = moment(this.get(property), segmentFormat === 'date' ? FORM_DATE_FORMAT : FORM_TIME_FORMAT);
+        if (this.constructor.modelName === 'event') {
+          oldDate = oldDate.tz(this.timezone, true);
+        }
       } else {
         oldDate = newDate;
       }