Answer by Jason Foglia for Detecting an "invalid date" Date instance in JavaScript

I seen some answers that came real close to this little snippet.

JavaScript way:

function isValidDate(dateObject){ return new Date(dateObject).toString() !== 'Invalid Date'; }
isValidDate(new Date('WTH'));

TypeScript way:

const isValidDate = dateObject => new Date(dateObject ).toString() !== 'Invalid Date';
isValidDate(new Date('WTH'));