How to format a Date as an ISO 8601 string in JavaScript?

How to Output an ISO 8601 Formatted String in JavaScript

To render the title portion of the given snippet, you can utilize the inbuilt toISOString() function. Here's how to use it:

const date = new Date();
const isoDate = date.toISOString();

This will return a string in ISO 8601 format, which includes the date and time components:

"2023-05-24T16:03:45.123Z"

Alternatively, if 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';
    };
  }());
}

console.log(new Date().toISOString());

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