Re: Changing time zone on AD Domain Controllers

Again the UTC time will not change. Only the local displayed time.

The computer does its thinking in UTC, regardless of the TZ and DST changes you make, it doesn't change internally.

UTC and TZ simply manipulate the info displayed to you the user. The only time that can come into play with the internal time is when you set the time. If you have a computer set with one TZ value and you think it has another and set the clock, the internal UTC time will then be wrong regardless of what the clock says. So the main thing to keep in mind is don't dork with the actual time of the machine, simply change TZ/DST settings as needed.

--
Joe Richards Microsoft MVP Windows Server Directory Services
Author of O'Reilly Active Directory Third Edition
www.joeware.net


---O'Reilly Active Directory Third Edition now available---

http://www.joeware.net/win/ad3e.htm


Jake20 wrote:
I am going from Eastern time zone to Central Time Zone , so the time
will be going back an Hour.
So, the actualy time will change by 1 hour.
Is there anything that needs to be done after that?
thanks!







Herb Martin wrote:
"Joe Richards [MVP]" <humorexpress@xxxxxxxxxxx> wrote in message
news:Oh1S4SrNHHA.2140@xxxxxxxxxxxxxxxxxxxxxxx
No.

Computers maintain the time in UTC internally. TZ and DST changes do not
have impact on the internal workings; it is simply for displaying the
internal time in a format that a human can comfortably deal with. Now if
you have crappy apps that do everything in localtime, those might have an
issue.
Everything Joe said with one caveat:

As long as you are changing the time zone because of the time zone,
and not because they are set to the wrong time zone and showing what
appears to be the correct time (and thus is WRONG.)

In that case, you would probably also change the time and now we
have to figure out did time just change by HOURS.

Time must be set to agree with the time zone that is also set or the
time will be incorrect (in GMT.)

I regularly take Domain Controllers to class in other cities, change
the time zone, bring them back, and again change the time zone
with no ill effects.

--
Herb Martin, MCSE, MVP
http://www.LearnQuick.Com
(phone on web site)

.

Relevant Pages

  • Re: Changing time zone on AD Domain Controllers
    ... TZ and DST changes do not ... have impact on the internal workings; it is simply for displaying the ... As long as you are changing the time zone because of the time zone, ...
    (microsoft.public.win2000.active_directory)
  • Re: Question about ISO8601 vs. strftime()
    ... online references to ISO8601 just get it wrong? ... that link only shows the form with the UTC ... but not the offset as far as I can tell. ... assumed to be in some local time zone. ...
    (comp.programming)
  • Re: Time Zones as politics
    ... be in a different time zone from his arch-rival, ... we are not permitted to criticize him in any way because after ... UTC +5 AKA Eastern Standard Time. ... Soon upon the establishment of the Greenwhich Meridian as the time ...
    (alt.horology)
  • Re: Received mail timestamp is off by 7 hours
    ... It should be one hour ahead of UTC right now. ... Notice that the timestamp on your local e-mail server corresponds to ... the CMOS real-time clock should be set to ... UTC and fix your time zone to match your location. ...
    (freebsd-questions)
  • Re: SWbemDateTime to Win 2k Compatible
    ... UUU is number of minutes to subtract from current time to get UTC. ... The TimeWritten property is not an Integer8 value, ... ' Get current date/time less 2 hours. ... This assumes your time zone bias is -480 minutes. ...
    (microsoft.public.scripting.vbscript)