The "one-true-way" to synchronize time - NTP
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- NTP is the network-time-protocol that adjusts the time in a fluent
- NTP requires a server on one machine, and clients on other machines.
- The clients will measure the time-differences (and the network
delays), and will get the clock of the client synchronized with that
of the server up to few milli-seconds.
- This process is delicate, and can take several days to stabilize,
if the network connection between the machines presents varying
- Now go read
The NTP FAQ and HOWTO.