Serge's Technology View » date manipulations http://blog.dragonsoft.us Talk about Technologies, Software Architecture and Management Tue, 31 Jan 2012 01:43:34 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 SQL date operations: Last 90 days, Get Date from DateTime… http://blog.dragonsoft.us/2008/05/12/sql-date-operations-last-90-days-get-date-from-datetime/ http://blog.dragonsoft.us/2008/05/12/sql-date-operations-last-90-days-get-date-from-datetime/#comments Mon, 12 May 2008 20:14:16 +0000 Serguei Dosyukov http://blog.dragonsoft.us/?p=179 Continue reading →]]> I am continuing putting some common examples of operations for Microsoft SQL Server.
In addition to some of the Date related code snippets published before, there are few more today:

-- Last 90 days:
select DATEADD(day, -90, GETDATE())
-- Get Date portion of DateTime value
select DATEADD(d, 0, DATEDIFF(d, 0, getdate()))
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Colegue of mine asked me this question… WOW! What do you know…
It is actually very easy if we think about it for a second…

So lets fun begin…

--First Day of the Current Month:
select DATEADD(mm, DATEDIFF(mm, 0, GETDATE()), 0)
-- Last Day of the Current Month:
select DATEADD(ms, -3, DATEADD(mm, DATEDIFF(m, 0, GETDATE()) + 1, 0))
-- Last Day of Prior Month:
select DATEADD(ms, -3, DATEADD(mm, DATEDIFF(mm, 0, GETDATE()), 0))
-- First Day of the Current Year:
select DATEADD(yy, DATEDIFF(yy, 0, GETDATE()), 0)
-- Last Day of the Current Year:
select DATEADD(ms, -3, DATEADD(yy, DATEDIFF(yy, 0, GETDATE()) + 1, 0))
-- Last Day of Prior Year:
select DATEADD(ms, -3, DATEADD(yy, DATEDIFF(yy, 0, GETDATE()), 0))

And some more…

-- First Day of the Quarter:
select DATEADD(qq, DATEDIFF(qq, 0, GETDATE()), 0)
-- Monday of the Current Week:
select DATEADD(wk, DATEDIFF(wk, 0, GETDATE()), 0)
-- Midnight for the Current Day:
select DATEADD(dd, DATEDIFF(dd, 0, GETDATE()), 0)
-- First Monday of the Month:
select DATEADD(wk, DATEDIFF(wk, 0, DATEADD(dd, 6 - DATEPART(day, GETDATE()), GETDATE())), 0)
-- Last 2 full months
select DATEADD(ms, -3, DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 2, 0))
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