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




    Using toISOString()

    var 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.


    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) +


    Specification Status Comment
    ECMAScript 5.1 (ECMA-262)
    The definition of 'Date.prototype.toISOString' in that specification.
    Standard Initial definition. Implemented in JavaScript 1.8.
    ECMAScript 2015 (6th Edition, ECMA-262)
    The definition of 'Date.prototype.toISOString' in that specification.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support (Yes) (Yes) 9 (Yes) (Yes)
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

    See also

    Document Tags and Contributors

    Last updated by: fscholz,
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