Set system time using group policy

I need to set the system time on a group of XP clients using a group policy.  I am setting the times successfully now but I need the times on these computer to be six hours earlier than the current time.  Is there any way to do this with a group policy?
Mike_StevensAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
TIME is CRITICAL to a Windows domain - the time on the workstations MUST match the time on the servers (within a few minutes) or Kerberos authentication will FAIL and users won't be properly authenticated to the domain.  The PDC emulator is in charge of time sync for the domain.  Change the time there and disable it's internet time sync and that should do as you need.  BUT WHY do you need the time to be six hours earlier?  Time Zone issues?
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ChiefITCommented:
Sounds like EST with a 6 hour offset would put them in UTC time.  Or, am I going backwards?

I have a domain with many clients in and many clients out of that zone since our scientific data acquisition machines need UTC time while the rest of the domain uses local time (wherever that may be). I haven't figured this out yet LeeW, but changing zones doesn't seem to effect kerberos authentication, however being out of time synch by more than the +/- 5 minute synchronization flag of the PDCe does. Maybe you can shed some light on that subjet.

Now I have a time server, so your application may be different in a way. I use Symmtime to synch to a time server. Then on the clients I need to be in a different time zone, I choose to change the zone. That does change the system clock zone and synchronizes the system clock of the client PC to my time server that I configured in Symmtime. But, for you, it will synch your client to an outside time server of your choosing and could put you out of synch with your PDCe unless your PDCe is synched up to the same outside time server.

In my personal experience, changing the time zone doesn't screw up kerberos authentication. However, changing the system clock time does.
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Mike_StevensAuthor Commented:
We need the time six hours eariler for billing issues.   Our second shift does our invoicing and we want all invoiced entered and billed after midnight to be dated the day before.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Well, you have to put the ENTIRE company behind 6 hours+ or reconfigure your software.  Or you could redesign your entire network to use a different type of directory system that doesn't use Kerberos.  

I don't know what kind of billing software you use, but most offer ways to set billing dates and/or remember the last date entered.
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Mike_StevensAuthor Commented:
The date cannot be changed in the billing software
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SaxtusCommented:
What about switching Windows time zone only?
Does that trick the billing system?
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Mike_StevensAuthor Commented:
Yes that would work but how do I change the system time zone using a group policy or script?
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SaxtusCommented:
Excellent, take look at this question then:
http://www.experts-exchange.com/Networking/Misc/Q_22025956.html
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SaxtusCommented:
Mike_Stevens, did the batch Windows time zone switching answer that I proposed, helped you?
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