How to Output ISO 8601 Formatted Strings in JavaScript?

Outputting ISO 8601 Formatted Strings in JavaScript

You have a Date object and want to render the ISO 8601 formatted string for its title, as seen in the following example:

<abbr title="2010-04-02T14:12:07">A couple days ago</abbr>

Your attempts to create the ISO date string using the getUTC*() methods have not been successful.

Solution

JavaScript provides a built-in function called toISOString() that returns the date and time in ISO 8601 format. You can use it as follows:

var date = new Date();
date.toISOString(); // "2011-12-19T15:28:46.493Z"

If for some reason your browser does not support toISOString(), you can use the following polyfill:

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

    function pad(number) {
      var r = String(number);
      if (r.length === 1) {
        r = '0' + r;
      }
      return r;
    }

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

  }());
}

With the polyfill in place, you can use the toISOString() function to generate the ISO 8601 formatted string.

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