Fix Outlook & Zoom creating events in UTC (#7283)

* Apply utc offset to time strings

* Zoom, create events in proper time zone

packages/app-store/office365calendar/lib/CalendarService.ts

@@ -1,5 +1,6 @@
 import type { Calendar as OfficeCalendar, User } from "@microsoft/microsoft-graph-types-beta";
 
+import dayjs from "@calcom/dayjs";
 import { getLocation, getRichDescription } from "@calcom/lib/CalEventParser";
 import { handleErrorsJson, handleErrorsRaw } from "@calcom/lib/errors";
 import logger from "@calcom/lib/logger";
@@ -239,6 +240,7 @@ export default class Office365CalendarService implements Calendar {
   };
 
   private translateEvent = (event: CalendarEvent) => {
+    const utcOffset = dayjs(event.startTime, event.organizer.timeZone).utcOffset() / 60;
     return {
       subject: event.title,
       body: {
@@ -246,11 +248,11 @@ export default class Office365CalendarService implements Calendar {
         content: getRichDescription(event),
       },
       start: {
-        dateTime: event.startTime,
+        dateTime: dayjs(event.startTime).utcOffset(utcOffset).format(),
         timeZone: event.organizer.timeZone,
       },
       end: {
-        dateTime: event.endTime,
+        dateTime: dayjs(event.endTime).utcOffset(utcOffset).format(),
         timeZone: event.organizer.timeZone,
       },
       attendees: event.attendees.map((attendee) => ({

packages/app-store/zoomvideo/lib/VideoApiAdapter.ts

@@ -196,11 +196,12 @@ const ZoomVideoApiAdapter = (credential: CredentialPayload): VideoApiAdapter =>
     };
 
     const recurrence = getRecurrence(event);
+    const utcOffset = dayjs(event.startTime, event.organizer.timeZone).utcOffset() / 60;
     // Documentation at: https://marketplace.zoom.us/docs/api-reference/zoom-api/meetings/meetingcreate
     return {
       topic: event.title,
       type: 2, // Means that this is a scheduled meeting
-      start_time: event.startTime,
+      start_time: dayjs(event.startTime).utcOffset(utcOffset).format(),
       duration: (new Date(event.endTime).getTime() - new Date(event.startTime).getTime()) / 60000,
       //schedule_for: "string",   TODO: Used when scheduling the meeting for someone else (needed?)
       timezone: event.organizer.timeZone,