export function calculateAge(dob) {
  const userDob = dob.split("/");
  const birthDate = new Date(userDob[2], userDob[1]-1, userDob[0]);

  const today = new Date();
  const yyyy = today.getFullYear();
  let mm = today.getMonth();
  let dd = today.getDate();
  if (dd < 10) dd = "0" + dd;
  if (mm < 10) mm = "0" + mm;
  const formattedTodayDate = new Date(yyyy, mm, dd);

  let year_difference =
    formattedTodayDate.getFullYear() - birthDate.getFullYear(); // 2001 - 2000 = 1
  let one_or_zero =
    formattedTodayDate.getMonth() < birthDate.getMonth() ||
    (formattedTodayDate.getMonth() === birthDate.getMonth() &&
      formattedTodayDate.getDate() < birthDate.getDate())
      ? 1
      : 0;
  let age = year_difference - one_or_zero;

  return age;
}