Find elapsed time in javascript

Question

I\'m new to JavaScript and I\'m trying to write a code which calculates the time elapsed from the time a user logged in to the current time.

Here is my code:-

Answer 1

var hours = 0;
if(minutes == 59 && seconds == 59) 
{ 
    hours = hours + 1; 
    minutes = '00'; 
    seconds == '00';
}