As you may or may not know, Windows XP provides an easy and fast way to synchronize your system time with an Internet time server (Control Panel/Date and Time/Internet Time). By default there are only two servers available (time.windows.com and time.nist.gov). To add more, just add them in the registry (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersio n\DateTime\Servers).

More time servers can be found here. 

Posted by TrOn

<-- Here is a reg file to add some more servers:

 

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Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\DateTime\Servers]
@="1"
"1"="time.windows.com"
"2"="time.nist.gov"
"3"="clock.isc.org"
"4"="timekeeper.isi.edu"
"5"="usno.pa-x.dec.com"
"6"="tock.usno.navy.mil"
"7"="tick.usno.navy.mil"
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-Jon