export function newExpiryDate(
  month: string | undefined,
  year: string | undefined
): Date | null {
  if (!month || !year) return null;

  if (isNaN(+month)) return null;
  if (isNaN(+year)) return null;

  if (month.length === 0 || month.length > 2) return null;
  if (year.length !== 2) return null;

  const dateString = `20${year}-${month.padStart(2, '0')}-01`;
  return new Date(dateString);
}