how to display count up timer in database field

Hi, I've made a count up timer, but I want to display the running time in the listview or other database field, can you help me?
Sorry my english is not good, I live in bali.

Here the screenshot when program run.
Attachment 96081

Here the timer code.
Attachment 96083

I want to be like this, durasi means duration that the time can running in database field when the program run.
Attachment 96085

The point is such as computer rental program at internet cafe. I have been looking everywhere but no solution.
Please help. Thank you masters.

Attached Images