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* What is NTP?

NTP is a protocol to synchronizing the clocks on host using publicly
available NTP servers.

* How use?

To use you must know NTP servers. Here list some of them:

0.debian.pool.ntp.org 1.debian.pool.ntp.org
2.debian.pool.ntp.org
uk.pool.ntp.org       ua.pool.ntp.org

Some servers are national. They can be found as ISO 639 code with
.pool.ntp.org suffix.

** Debian.

Install ntpdate package:

  $ sudo apt-get install ntpdate

and sync date with some NTP server:

  # sudo ntpdate 0.debian.pool.ntp.org

** Windows.

See

  http://support.microsoft.com/kb/q216734/
  http://support.microsoft.com/kb/q223184/
  http://support.microsoft.com/kb/307897/
                How to synchronize the time with the Windows Time service in Windows XP.
  http://support.microsoft.com/kb/216734/
                How to configure an authoritative time server in Windows 2000.