Parse a credit card date string into a date object and determine if it is expired - JavaScript

CreditCardStringParseAndValidateExpiration.js

/**
 Takes in the expirationDate param as: "3/2025" or "03/2025" etc...
 
 Rookie Implementation
**/

export default function isCreditCardExpired(expirtationDate) {
  const now = new Date();
  const currentMonth = now.getMonth() + 1; // 9
  const currentYear = now.getFullYear(); // 2022

  // Split + convert vals to INT
  const splitExpDate = expirtationDate.split("/").map((el) => +el);
  let ccMonth = splitExpDate[0];
  let ccYear = splitExpDate[1];
  let isExpired;

  if (currentYear > ccYear) {
    console.log("expired year, dude");
    isExpired = true;
  } else if (currentYear === ccYear && currentMonth > ccMonth) {
    // Year is the same so lets check months
    console.log("Good year but expired month, dude");
    isExpired = true;
  } else if (currentYear === ccYear && currentMonth === ccMonth) {
    console.log("Not expired");
    isExpired = false;
  } else {
    console.log("Still NOT expired");
    isExpired = false;
  }

  return isExpired;
}

const test = "6/2025";
const test2 = "12/2018";
const test3 = "10/2022";

console.log(isCreditCardExpired(test)); // False - not expired
console.log(isCreditCardExpired(test2)); // True - expired
console.log(isCreditCardExpired(test3)); // False - expired


/**

Better implentation.

**/

function isCreditCardExpired(expirtationDate) {
  // Split + convert vals to INT
  const splitExpDate = expirtationDate.split("/").map((el) => +el);
  const [ccMonth, ccYear] = splitExpDate;
  const today = new Date();
  const expirationDay = new Date();

  expirationDay.setFullYear(ccYear, ccMonth - 1, expirationDay.getDate());

  return expirationDay < today;
}

const test = "6/2025";
const test2 = "12/2018";
const test3 = "10/2022";

console.log(isCreditCardExpired(test)); // False - not expired
console.log(isCreditCardExpired(test2)); // True - expired
console.log(isCreditCardExpired(test3)); // False - expired