How can I add the code so that the time increases by 1 every second?

Question

Vue.js

There is a prepared part in the code so that each task displays the time elapsed since it was added. How can I add the code so that this time increases by 1 every second.

Prepared code in lines 3-5 (Vue + No-Library (pure JS))

Code on jsfiddle

Answer 1

More or less like this.