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Getting the First and last days of month, quarter and week
From Wiki
By using dateadd and datediff together you can get the first and last day for years, quarters, months and weeks(be careful of ISO weeks!) Run the code below to see how this works
- DECLARE @d DATETIME
- SET @d = '20071010'
- SELECT DATEADD(yy, DATEDIFF(yy, 0, @d), 0) AS FirstDayOfYear,
- DATEADD(yy, DATEDIFF(yy, 0, @d)+1, -1) AS LastDayOfYear,
- DATEADD(qq, DATEDIFF(qq, 0, @d), 0) AS FirstDayOfQuarter,
- DATEADD(qq, DATEDIFF(qq, 0, @d)+1, -1) AS LastDayOfQuarter,
- DATEADD(mm, DATEDIFF(mm, 0, @d), 0) AS FirstDayOfMonth,
- DATEADD(mm, DATEDIFF(mm, 0, @d)+1, -1) AS LastDayOfMonth,
- DATEADD(wk, DATEDIFF(wk, 0, @d), 0) AS FirstDayOfWeek,
- DATEADD(wk, DATEDIFF(wk, 0, @d)+1, -1) AS LastDayOfWeek
Change the value of the @d variable to test with other dates
Contributed by: SQLDenis
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