AppSync `AWSDate` scalar validation regex (JavaScript / ECMAScript)

validation.js

/**
 *  LICENSE: MIT
 * 
 *  References / attribution:
 *  date portion:
 *    - https://www.myintervals.com/blog/2009/05/20/iso-8601-date-validation-that-doesnt-suck/
 *  timezone portion: 
 *    - https://www.oreilly.com/library/view/regular-expressions-cookbook/9781449327453/ch04s07.html
 */

const isAWSDate = /^([+-]?\d{4}(?!\d{2}\b))((-?)((0[1-9]|1[0-2])(\3([12]\d|0[1-9]|3[01]))?|W([0-4]\d|5[0-2])(-?[1-7])?|(00[1-9]|0[1-9]\d|[12]\d{2}|3([0-5]\d|6[1-6])))([T\s]((([01]\d|2[0-3])((:?)[0-5]\d)?|24:?00)([.,]\d+(?!:))?)?(\17[0-5]\d([.,]\d+)?)?([zZ]|([+-])([01]\d|2[0-3]):?([0-5]\d)?)?)?)?(Z|[+-](?:2[0-3]|[01][0-9])(?::?(?:[0-5][0-9]))?)?$/;

export default date => isAWSDate.test(date)