Web/JavaScript/Reference/Global objects/Date/toISOString

The toISOString() method returns a string in simplified extended ISO format (ISO 8601), which is always 24 or 27 characters long (YYYY-MM-DDTHH:mm:ss.sssZ or ±YYYYYY-MM-DDTHH:mm:ss.sssZ, respectively). The timezone is always zero UTC offset, as denoted by the suffix "Z".

Syntax

dateObj.toISOString()

Return value

A string representing the given date in the ISO 8601 format according to universal time.

Polyfill

This method was standardized in ECMA-262 5th edition. Engines which have not been updated to support this method can work around the absence of this method using the following shim:

if (!Date.prototype.toISOString) {
  (function() {

    function pad(number) {
      if (number < 10) {
        return '0' + number;
      }
      return number;
    }

    Date.prototype.toISOString = function() {
      return this.getUTCFullYear() +
        '-' + pad(this.getUTCMonth() + 1) +
        '-' + pad(this.getUTCDate()) +
        'T' + pad(this.getUTCHours()) +
        ':' + pad(this.getUTCMinutes()) +
        ':' + pad(this.getUTCSeconds()) +
        '.' + (this.getUTCMilliseconds() / 1000).toFixed(3).slice(2, 5) +
        'Z';
    };

  })();
}

Examples

Using toISOString()

let today = new Date('05 October 2011 14:48 UTC')

console.log(today.toISOString())  // Returns 2011-10-05T14:48:00.000Z

The above example uses parsing of a non–standard string value that may not be correctly parsed in non–Mozilla browsers.

Specifications

Specification
ECMAScript (ECMA-262)The definition of 'Date.prototype.toISOString' in that specification.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`toISOString`	Chrome Full support 3	Edge Full support 12	Firefox Full support 1	IE Full support 9	Opera Full support 10.5	Safari Full support 5	WebView Android Full support ≤37	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 11	Safari iOS Full support 4.2	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100

Legend

Full support: Full support