Append Dynamic version(variable ) in Script tag and stylesheet based on time

<script src="/assets/abc.js?v='+new Date.getTime();" type="text/javascript"></script>

<link href="/assets/cder.css?v='+new Date.getTime();"  rel="stylesheet"></link>

I am trying to add dynamic version(variable ) in script tag and stylesheet based on current time?

How to achieve that?

from Append Dynamic version(variable ) in Script tag and stylesheet based on time