Sync time on ubuntu, is it the same?

Question

ubuntu

There are 2 VDS, different companies, assemblies. Both on ubuntu 18.04. On both running node js + function I give the time to the node console:

function getDateTime() {
  var date = new Date();
  console.log(date.getHours() + ':' + date.getMinutes() + ':' + date.getSeconds() + ':' + date.getMilliseconds())
}

I issue time, only under a certain condition, when communicating with the server via a websokcet connection. They answer with a difference of 4 milliseconds. The question is - do they give the time correctly or can there still be a significant difference? For example, with windows and ubuntu, I have a difference of 3 seconds in function (the time that is issued), but in fact ubuntu and windows respond at 1 time.