JavaScript NTP time

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First of all, the JS scheduler has a certain granularity – that is, you can request an interval smaller than, say, 20 msec, but it will not fire immediately – what you could see is 20 events fired off every 20 msec.

Second, even if you could, this is not a good idea: you would be making 1000 requests every second, from every computer which uses this script. Even if the client and their connections could handle this, it’s nothing short of a DDoS for the JSON server.

What you could do is this:

  • get time from JSON-NTP (once), this will be a Date
  • get local time (once), this will be a Date
  • calculate the difference between NTP and local time (once), this will likely be the number of msec that local time is off
  • for every time calculation, take the difference into account

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