-- 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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