Question : How to sync time for all workstations in a windows 2000 domain?

I have workstations which have different time in a windows 2000 domain. I learned that when a workstaion is authenticated, the workstation will obtain the time from the server. Then the workstaiton and the domain controllers will have the same time.
My workstations which are all Windows XP are not syncing time with the domain controllers when they login. Is there any setting I need to enable?
Thank you for your help.

Answer : How to sync time for all workstations in a windows 2000 domain?

On the xp client machines members of the AD domain:
1.      Click Start, point to All Programs, point to Accessories, and then click Command Prompt.
2.      Type w32tm /resync, and then press ENTER.

On the Domain controller to sync with external timesource
1.      Click Start, point to All Programs, point to Accessories, and then click Command Prompt.
2.      Type the following line, where peerlist is a comma-separated list of Domain Name System (DNS) names or IP addresses of the appropriate time sources, and then press ENTER:
w32tm /config /syncfromflags:manual /manualpeerlist:peerlist
3.      Type w32tm /config /update, and then press ENTER.