async function sleep(ms) {
  const getNetworkTime = async () => {
    const response = await fetch('https://timeapi.io/api/Time/current/zone?timeZone=Europe/Amsterdam');
    const data = await response.json();
    return new Date(data.dateTime);
  };

  const start = await getNetworkTime();
  let now = start;
  
  while (now.getTime() - start.getTime() < ms)
    now = await getNetworkTime();
}