W2K Server to use external time server

I have a windows 2000 Server which is a primary domain controller for my network. Currently all pcs connected to the server get the time that the server has.
Unfortunately the server is not setup to sychronise to any external server.
Can someone please help me to setup my W2K Server to connect to an external time server so that its clock is never wrong.
I am in NSW Australia, so Sydney would be the correct time for me. If someone can help setup my W2K server to connect to a syndey time server i would award all points.