NTP Sync with switch (without internet)

Hi,
  We have 20 switchs around our network, all switchs without internet and if we set the clock it will be till restart.
  Please advice.

We have 20 switchs around our network, all switchs without internet
Cisco appliances do not come with built-in "clocks".  The clocks that came with routers and switches can and will drift.  So you'll need something for the appliances to synchronize NTP/SNTP with.  IF your appliances don't have access to the internet, then you'll need something like a GPS-based NTP server.  

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