get the coming saturday date of a given date

amlesh · August 14th, 2007, 02:02 AM

Hi all,

i getting problem to get the coming saturday date of a given date.

My real problem is that i want it for all @@DATEFIRST Settings.

Plz help.

Thanks.

gaurav_jain2403 · August 14th, 2007, 05:36 AM

The logic is that use Datename(dw,'your_date'). Now this will return the day like monday,tuesday, etc. Accordingly, you can add the number of days into it like if it returns monday, Add 5 to the date as: Dateadd(dd,5,'your_date'). You can also use Case in the query. And you will also have to check that date should never cross 28, 30 or 31 depending on the month. If so happens, you need to update the month too and in case of december might be year also.

Gaurav

amlesh · August 14th, 2007, 05:46 AM

thanks for your help, but how about for different @@DATEFIRST Settings.

Any help will be grateful.

Amlesh

Gert · August 16th, 2007, 04:01 AM

Hi.

The following code will return the next saturday for any @@DATEFIRST settings. If the given date IS a saturday, then it will return the saturday a week later. There is no need to adjust for number of days in month or the crossing of a year-boundary.

Code:

DECLARE @YourDate datetime
SET @YourDate = '20070803'

DECLARE @NextSaturday datetime
DECLARE @OrigDateFirst int
SET @OrigDateFirst = @@DATEFIRST    --Save original @@DATEFIRST value

SET DATEFIRST 6 --saturday as first day of week

SET @NextSaturday = DATEADD(day,8-DATEPART(dw,@YourDate),@YourDate)

SET DATEFIRST @OrigDateFirst    --Restore @@DATEFIRST

SELECT @NextSaturday

Gert

Peso · August 16th, 2007, 03:42 PM

Why the long code? There is absolutely no need to involve SET DATEFIRST option setting.

SELECT DATEADD(WEEK, DATEDIFF(WEEK, 0, CURRENT_TIMESTAMP), 5)

Jeff Moden · August 16th, 2007, 06:58 PM

Spot on, Peter...

--Jeff Moden

Peso · August 17th, 2007, 03:20 AM

Thanks Jeff!

In-depth explanation of how DATEDIFF works can be found here
http://www.sqlteam.com/article/dated...on-demystified

Gert · August 17th, 2007, 03:42 AM

Hmm, I must admit that your solution was a bit more clever than mine, Peter, but since the OP was grateful for ANY help (and no one had given it), I went for the solution I could come up with at the moment.. hence the long code.

But all praise to you.. :)

Gert

Peso · August 17th, 2007, 04:20 AM

I just objected to changing the DATEFIRST setting forth and back.

If the situtation were reversed, wouldn't you like a solution that was as simple as possible?

Gert · August 17th, 2007, 05:13 AM

Yes indeed, and I have no objection to your objection :)

I really did like your solution better, so the praising was well meant... no ulterior motive behind that.

Keep up the good work.

Gert