Decrement a variable once a day - Javascript

Question

I'm trying to decrement a variable once a day. I have written the following code for that.

var counter = 10; //any value

setInterval(function() {

  counter = counter - 1;

}, 86400000);

Is there a better or efficient way to achieve the same thing ?

P.S : - I do not wish to use any libraries.

Answer 1

The only thing I see you miss is to set the initial value of counter variable.
I would write:

var counter = 1000; // or any useful value

setInterval(function() {
  --counter;
}, 24 * 60 * 60 * 1000); // this is more self-explanatory than 86400000, and, being evaluated just once, it will have a tiny effect on the performace of the script