Azure Mobile Service, how to only update or ignore update some columns
<p>I have got an item in the table and update some column value and update it into the DB.
But why this Datetimeoffset column is changed auto to another time zone ?</p>

<ol>
<li>This is an item in DB</li>
</ol>

<p><a href="https://i.stack.imgur.com/0egFc.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0egFc.jpg" alt="Record at first time"></a></p>

<ol start="2">
<li>Using javascript backend to read and update it</li>
</ol>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>request.service.tables.getTable('Ticket')
.where({ id: ticketId }).read({
  systemProperties: ['__createdAt', '__updatedAt'],
  success: function (result) {
    if (result.length === 0) {
      console.log("ticket does not exist");
      response.send(statusCodes.NOT_FOUND, { message: "ticket does not exist" });
    }
    //Exists; update it
    else {
      // do update some column
      //...
      //...
      request.service.tables.getTable('Ticket').update(result[0]);
      }</code></pre>
</div>
</div>
</p>

<ol start="3">
<li>I don't change the value of DatetimeOffset column, but it is changed.</li>
</ol>

<p><a href="https://i.stack.imgur.com/nclh8.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nclh8.jpg" alt="enter image description here"></a></p>

<p>How to I can ignore update it ?</p>