JAVASCRIPT

check if date time string is invalid date js

const isValidDate = function(date) {
    return (new Date(date) !== "Invalid Date") && !isNaN(new Date(date));
}

js check if date object is invalid

const isValid = !Number.isNaN(new Date(timestamp).getTime())

detect invalid date js

isNaN(d.getTime())

js check invalid date

const validDate = !isNaN(Date.parse('foo'))