javascript - time counter since start date and time

Question

I have a new business, where I just hired someone to work for me, I am trying to make it easy for her to track her time, so I created a clock in button, that creates a recor

Answer 1

Get the difference between two dates by subtracting them:

var duration = end - start;

This will give you the number of milliseconds between the dates. You can use the milliseconds to figure out hours, minutes, and seconds. Then it's just a matter of string manipulation and writing the value to the page. To update the timer once per second, use setInterval():

setInterval(writeDuration, 1000);