You have specified the wrong attribute for tag, you will need to add src, not href, so your tag would be like this

<img src="https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.theverge.com%2F2015%2F9%2F1%2F9239769%2Fnew-google-logo-announced&psig=AOvVaw09j8UfowDYSj2kpOO7UnqB&ust=1625896727471000&source=images&cd=vfe&ved=0CAoQjRxqFwoTCOi17bqn1fECFQAAAAAdAAAAABAI"/>

Two errors:

1. You use img href="" instead of img src=""
2. You use an image url that is a redirected link from google.com to the image location. You need to use a clean https://.. link.

If you fix these two your code will work.

 <div class="top"   display=flex >
        <div>
        <p>Date/Time: <span id="date-time"></span></p>
        <script>
         var dt = new Date();
         document.getElementById('date-time').innerHTML=dt;
         </script>
        </div>
        <div align=right>
         <img href="https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.theverge.com%2F2015%2F9%2F1%2F9239769%2Fnew-google-logo-announced&psig=AOvVaw09j8UfowDYSj2kpOO7UnqB&ust=1625896727471000&source=images&cd=vfe&ved=0CAoQjRxqFwoTCOi17bqn1fECFQAAAAAdAAAAABAI"   alt="logo"  width="16"  height="16" > 
        </div>

    </div>

I have search earlier and found that we have to give image url and I tried using it but it is still not displaying image.

the image is the screenshot of the email received