Requesting a some help to calculate the difference in two times (Trickier than you might think)

I'm trying to create a cell where I can track the elapsed time since an entry was created. This will explain more:

The <Elapsed time> cell will be the difference between the current time and the <start time>. It should update with each second essentially, as current time does as well.

Does anyone know if this is possible with zoho docs?