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DC in different time zones - Perth and Sydney

    Question

  • Hello,

    I want to set up a Windows 2008 Domain for a client. The client has 2 offices in Australia: one in Sydney and the other in Perth.

    The issue here is this: DC's Time Sync.

    Setup:
    - It will be one domain, with 2 DC's, one each per site

    Now the confusion, Sydney and Perth are in different time zones, so there will be time difference, how will this work?

    Will the 2 DC's be able to replicate?

    For some reason, if the Perth DC goes offline, can the clients in Perth authenticate to the Sydney DC (keeping in mind the time difference)

    Am in the planning process, the answers to this questions will help a lot.
    Sunday, March 1, 2009 4:13 PM

Answers

  •     The times will not be different. Active Directory does not use the local time when it does the comparison. Local time settings only affect what is diplayed on the screen of the local computer.
    Bill
    Monday, March 2, 2009 12:59 AM
  • HI,

    As Bill explained, Domain controllers store time in Coordinated Universal Time (UTC). When viewed through the Active Directory Sites and Services snap-in, time settings in site link object schedules are displayed according to the local time of the computer on which the snap-in is being run. However, replication occurs according to UTC.

    For example, suppose Seattle adheres to Pacific Standard Time (PST) and Japan adheres to Japan Standard Time (JST), which is 17 hours later. If a schedule is set on a domain controller in Seattle and the site link on which the schedule is set connects Seattle and Tokyo, the actual time of replication in Tokyo is 17 hours later.


    For more information, please refer to the following article:
    http://technet.microsoft.com/en-us/library/cc755994.aspx

    Thanks.


    This posting is provided "AS IS" with no warranties, and confers no rights.
    Monday, March 2, 2009 11:55 AM
    Moderator

All replies

  •     Active Directory does not use local time. You will not have any problems caused by time zone settings.
    Bill
    Monday, March 2, 2009 12:41 AM
  • DC's can only have a time difference of 5 MINS, what does that mean?

    There will be a time difference between DC's, that is what confuses me....
    Monday, March 2, 2009 12:49 AM
  •     The times will not be different. Active Directory does not use the local time when it does the comparison. Local time settings only affect what is diplayed on the screen of the local computer.
    Bill
    Monday, March 2, 2009 12:59 AM
  • HI,

    As Bill explained, Domain controllers store time in Coordinated Universal Time (UTC). When viewed through the Active Directory Sites and Services snap-in, time settings in site link object schedules are displayed according to the local time of the computer on which the snap-in is being run. However, replication occurs according to UTC.

    For example, suppose Seattle adheres to Pacific Standard Time (PST) and Japan adheres to Japan Standard Time (JST), which is 17 hours later. If a schedule is set on a domain controller in Seattle and the site link on which the schedule is set connects Seattle and Tokyo, the actual time of replication in Tokyo is 17 hours later.


    For more information, please refer to the following article:
    http://technet.microsoft.com/en-us/library/cc755994.aspx

    Thanks.


    This posting is provided "AS IS" with no warranties, and confers no rights.
    Monday, March 2, 2009 11:55 AM
    Moderator
  • Thank you all, I have understood it.
    Monday, March 2, 2009 12:38 PM