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tracmonali
Starting Member
16 Posts |
 Posted - 2012-04-15 : 15:22:00
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| Hello, I wish to have one of my date columns to adjust with dst and utc and populate in computed columns. For ex: during dst the date col has to be pushed back to 6 hrs else 5 hrs. set @timediff = datediff(hh, col1, getutcdate()) this col1 is from tableselect col1, (computed col) col2 = case (@timediff) case '5' then col1 date is pushed back 5 hrs case '6' then col1 date is pushed back 6 hrsfrom tableAny help appreciated? |
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visakh16
Very Important crosS Applying yaK Herder
52326 Posts |
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tracmonali
Starting Member
16 Posts |
Posted - 2012-04-15 : 17:27:12
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| Thanks. but I do not wish any start date and end date of DST. All I want is col1 in my above query is logdate (that is populated using GMT) and the computed date will be wrt to DST. ALso this will be in a stored procedure. SO could I request for something simpler, which can be computed in 1 select stmt. |
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visakh16
Very Important crosS Applying yaK Herder
52326 Posts |
Posted - 2012-04-15 : 17:31:23
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| then what should be using is datetimeoffset------------------------------------------------------------------------------------------------------SQL Server MVPhttp://visakhm.blogspot.com/ |
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sunitabeck
Master Smack Fu Yak Hacker
5155 Posts |
Posted - 2012-04-15 : 17:55:29
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DATETIMEOFFSET is not daylight savings time-aware. If you want to calculate the offset for the current time, you can use this:SELECT DATEDIFF(hour,GETDATE(),GETUTCDATE()) In US Central Time Zone, it will return 5 hours during daylight savings time period and 6 during standard time period.If you are trying to calculate historical data, you will need something like they have in the link that Visakh posted earlier. However, the code in there is incorrect for dates earlier than 2007. An act of Congress messed it up for dates earlier than 2007. (Yes, I realize that last sentence is stating the obvious about US Congress). |
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tracmonali
Starting Member
16 Posts |
Posted - 2012-04-15 : 18:42:12
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| Thanks a lot sunitabeck. your DATETIMEOFFSET and historical data information is helpful. |
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gmt dst adjust