String is ISO formatted date
JavaScript, Date · Nov 29, 2020

Checks if the given string is valid in the simplified extended ISO format (ISO 8601).
- Use the
Date
constructor to create aDate
object from the given string. - Use
Date.prototype.valueOf()
andNumber.isNaN()
to check if the produced date object is valid. - Use
Date.prototype.toISOString()
to compare the ISO formatted string representation of the date with the original string.
const isISOString = val => { const d = new Date(val); return !Number.isNaN(d.valueOf()) && d.toISOString() === val; }; isISOString('2020-10-12T10:10:10.000Z'); // true isISOString('2020-10-12'); // false