title: Updating the end date of a recursive meeting via Graph API not working
body: <p>I am currently using Office Graph API to handle meetings of users Calenders.
  I have subscribe to receive notifications if a event is create, updated and deleted using the "/subscriptions" request!
  My users are using the Lisbon time zone (in summer = UTC+1, winter = UTC)</p>
  
  <p>When an event is created in office 365 by a user, on the side of my application, if the event is a recursive meeting with no end date I update (via the Graph API) the meeting so that it has an end date. [Note: One of the rules of my application is that no meeting has more than 365 days.]</p>
  
  <p>Problem : The series is shrunk to the end date that I updated via API but the time is left with the wrong timezone. I have already tried to request the API without timezone and I have already requested update with timezone UTC and timezone UTC +1 and I always have the same problem. On the office side, after my update, the meeting time is one hour less.</p>
  
  <p>The following image is a exemple of series, that has a no end range:</p>
  
  <p><a href="https://i.stack.imgur.com/llTkm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/llTkm.png" alt="enter image description here"></a></p>
  
  <p>I fetch some child meetings before update and it is correct. In portugal the time change day is 2019-03-30, so day 30 start in 10h00 UTC and day 31 09:00 UTC:</p>
  
  <p><a href="https://i.stack.imgur.com/bCV29.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/bCV29.png" alt="enter image description here"></a> </p>
  
  <p>Here I send the request to office 365 to update end of recurrence (end date):</p>
  
  <p><a href="https://i.stack.imgur.com/PC499.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PC499.png" alt="enter image description here"></a></p>
  
  <p>After send the update request, I fetch the same children and 2019-03-30 and day 2019-03-31 have both start as 10h00.
  After this update in client calendar the meetings have wrong start and end hour:</p>
  
  <p><a href="https://i.stack.imgur.com/MZMrG.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/MZMrG.png" alt="enter image description here"></a></p>
  
  <p>I have already tried putting in the field of Graph API recurrenctTImeZone: UTC, GMT Standard Time and simply do not put anything and I always have the same return. I can not solve this problem.</p>
  
  <p>Do you have any idea what might be wrong?</p>