i have problem when i try to get the value of cookie in js [duplicate]

i set the cookie value successful but when try to get the value i have problem i retrieve only first part of cookie not whole cookie string

class CookiesService{
    setCookie(expireDateForCookie){
      let cookie = 'lang=en;SameSite=Lax;expires='+expireDateForCookie;
      console.log(cookie);// result => lang=en;SameSite=Lax;expires=Mon, 01 Jul 2024 08:57:09 GMT
      document.cookie = cookie ;//this step done sucssesfuly i see the cookie value in browser
      this.cookies = document.cookie ;

      console.log(document.cookie);
      // result => lang=en
      // but im expect => lang=en;SameSite=Lax;expires=Mon, 01 Jul 2024 08:57:09 GMT    

      console.log(this.cookies);
     // result => lang=en
     // but i expect => lang=en;SameSite=Lax;expires=Mon, 01 Jul 2024 08:57:09 GMT

    }
}

let cookiesService = new CookiesService();
cookiesService.setCookie('Mon, 01 Jul 2024 08:57:09 GMT');