@skhemata/skhemata-form/src/validator/lib/isBefore.js

Skhemata Form Web Component. This web component can be used as base web component when working with forms and inputs.

import assertString from './util/assertString';
import toDate from './toDate';

export default function isBefore(str, date = String(new Date())) {
  assertString(str);
  const comparison = toDate(date);
  const original = toDate(str);
  return !!(original && comparison && original < comparison);
}