如何使用此代码设置cookie在x天后过期？

function setCookie(name, value, days) {
  var expires = "";
  if (days) {
    var date = new Date();
    date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
    expires = "; expires=" + date.toUTCString();
  }
  document.cookie = name + "=" + (value || "") + expires + "; path=/";
}

from datetime import datetime, timedelta

def set_cookie(name, value, days):
    expires = datetime.now() + timedelta(days=days)
    cookie = f"{name}={value}; Expires={expires.strftime('%a, %d %b %Y %H:%M:%S GMT')}; Path=/"
    return cookie

function set_cookie($name, $value, $days) {
    $expires = time() + ($days * 24 * 60 * 60);
    setcookie($name, $value, $expires, '/');
}