Convert an ISO date to the date format yyyy-mm-dd in JavaScript

Just crop the string:

var date = new Date("2013-03-10T02:00:00Z");
date.toISOString().substring(0, 10);

Or if you need only date out of string.

var strDate = "2013-03-10T02:00:00Z";
strDate.substring(0, 10);

Try this

date = new Date('2013-03-10T02:00:00Z');
date.getFullYear()+'-' + (date.getMonth()+1) + '-'+date.getDate();//prints expected format.

Update:-

As pointed out in comments, I am updating the answer to print leading zeros for date and month if needed.

date = new Date('2013-08-03T02:00:00Z');
year = date.getFullYear();
month = date.getMonth()+1;
dt = date.getDate();

if (dt < 10) {
  dt = '0' + dt;
}
if (month < 10) {
  month = '0' + month;
}

console.log(year+'-' + month + '-'+dt);

You could checkout Moment.js, Luxon, date-fns or Day.js for nice date manipulation.

Or just extract the first part of your ISO string, it already contains what you want. Here is an example by splitting on the T:

"2013-03-10T02:00:00Z".split("T")[0] // "2013-03-10"