How to Convert a JavaScript Date to ISO 8601 Format (yyyy-mm-dd)?

Converting JavaScript Date to ISO 8601 Format

Question: I have a JavaScript date in the format "Sun May 11, 2014". How can I convert it to the ISO 8601 format of "2014-05-11"?

Initial Attempt:

The code snippet below attempts to format the date using the split() method but fails to achieve the desired result:

function taskDate(dateMilli) {
    var d = (new Date(dateMilli) + '').split(' ');
    d[2] = d[2] + ',';

    return [d[0], d[1], d[2], d[3]].join(' ');
}

Solution:

To convert the date to ISO 8601 format, leverage the built-in toISOString() method. This method returns the date in a format that conforms to the ISO 8601 standard:

let yourDate = new Date();
yourDate.toISOString().split('T')[0];

The toISOString() method returns a string in the following format:

yyyy-mm-ddThh:mm:ss.ssssssZ

The split('T')[0] part of the code retrieves only the date portion of the string, excluding the time and timezone information.

Additional Note:

To handle timezone properly, modify the code as follows:

const offset = yourDate.getTimezoneOffset();
yourDate = new Date(yourDate.getTime() - (offset * 60 * 1000));
return yourDate.toISOString().split('T')[0];

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