How to read cookie expiration date in Express?

I want to read the expiration date of a cookie.
This is how I set up a cookie:

res.cookie("tokenCookie", token, {
      secure: false,
      httpOnly: true,
      expires: dayjs().add(1, "hour").toDate(),
    });

I used the cookie-parser library and req.cookies returned the key value pair of the cookie and its value. However, the value doesn’t include the expiration date of the cookie, only the value I assigned the cookie to store.

{
  tokenCookie: 'sample.auth.token'
}

How can I read or access the expiration date in the expires attribute?