Working with JS Date and Date-fns library

Date-FNS.js

// Max Date
const { format, isBefore, isValid, subYears, parseISO } = require('date-fns');

const maxDate = format(subYears(new Date(), 18), 'yyyy-MM-dd');
const maxResult = isBefore(dobDate, parseISO(maxDate, 1));

// Min Date
// Requires Date FNS
const { format, isAfter, subYears, parseISO } = require('date-fns');

const minDate = format(subYears(new Date(), 150), 'yyyy-MM-dd');
const maxResult = isAfter(dobDate, parseISO(maxDate, 1));