Can I force values in script for getting tag timestamp change for every 5 min?

I want to change Tag timestamp value for every 5 min without forcing values ? How to do without force values ?

What do you mean by force values?

If you want the timestamp to be 'right now', use an expression tag with a execution mode of FixedRate, and a Execution Rate of 5 minutes.

What do you want the value to be while timestamp is changing?

Whats your end goal for an updating timestamp?