Actually, I do not think you should set a timer at all. Think of it: you are going to access this website every second, or 60 times a minute, or 3600 times an hour ...
But a timer event every millisecond is crazy.
Sooner than later this website will block you, because you are using precious website traffic.
What you could do is find the time once from this website, and then at the GotText event, enable the timer and update your clock display at every Clock timer event.
But this thread was about reading text from a web page. A good way to do this is to find the URL you want to look at, display the website in a browser, click with your right mouse button on the text, choose "view page source" (or similar), which will give you a page of HTML.
It is not always possible or easy to find what you are looking for, but in your case it was: I found this piece of text:
<h1>Current IST time</h1>
<span class="hours">7</span><span class="minutes">51</span><span class="seconds">27</span><sup>pm</sup>
<p>Saturday, May 25, 2019</p>
So, you only need to look at class="hours">find whatever is here</ ... etc.