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Change Server Timezone in SQL Server

Posted on 2009-07-08
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Last Modified: 2012-05-07
Hi

I would like to know if anyone has any experience with changing the server timezone on a sql box, the user has SQL server 2005 installed on a Server box which is currently set to a US time zone, he would like to know of any problems with changing the time zone to BST regarding the SQL database.
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Question by:cntboys
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by:Raja Jegan R
ID: 24801633
There is nothing like SQL Server Timezone.

All timezones are referred from your Server OS timezones.
Hence in your Regional Settings, change the timezone from US to BST and this should work fine.

You might feel some gaps for some of the records during this time change.
Hence it is best adviced to perform this activity in your maintenance window.
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by:cntboys
ID: 24801689
"You might feel some gaps for some of the records during this time change"

Thanks for your reply, but can you clarify the above part of it
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by:Raja Jegan R
ID: 24801866
For eg: Assume if your current timezone is -5:30 and you are moving to GMT ie., 0:00.
Then current time of 20:30 will be corrected out there as 04:00 am the next day. Hence you feel gaps between these values.

Suppose if you run a query that finds difference between two records across these values, then you might find that as odd and I meant that one as gaps.

Hope this clarifies.
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by:cntboys
ID: 24802019
Will these gaps still be apparent when users log back in if the change is odne out of hours?
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Raja Jegan R earned 500 total points
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>> Will these gaps still be apparent when users log back in if the change is odne out of hours?

If you do it in a live machine these gaps will be apparent.
But if it is done in a known maintenance window, you can be sure that its a maintenance window in case you debug to find the cause of it.

Kindly analyze in your application whether any queries check for difference in hours / minutes so that you can be sure whether your system is impacted or not. If you dont have any queries like that, then you need not worry about that.
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