How to Generate an ISO 8601-Formatted Timestamp in JavaScript?

How to Output an ISO 8601-Formatted Timestamp in JavaScript

When displaying dates in a standardized format, ISO 8601 provides a structured and consistent way. This article delves into how to generate an ISO 8601-formatted string in JavaScript.

To address the question posed, you can utilize JavaScript's built-in function called toISOString() that natively converts a Date object into an ISO 8601 string. For instance:

var date = new Date();
date.toISOString(); // Output: "2023-03-08T10:15:30.000Z"

If, by any chance, your browser lacks support for toISOString(), the following alternative code snippet can be utilized:

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";
    };
  }());
}

By incorporating this fallback code, you can ensure compatibility with older browsers.

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