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Q&A for people interested in conceptual questions about life and challenges in a world where "cognitive" functions can be mimicked in purely digital environment

SELECT DATEADD(day, -((DATEPART(dw, GETDATE()) + @@DATEFIRST) % 7) - 6,DATEADD(day, DATEDIFF(day, 0, GETDATE()), 0)) as date_difference, 

DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()), 0) As First_Of_Current_Month
  , DateAdd(dd, -1, DateAdd(mm, DateDiff(mm, 0, GETDATE()) +1, 0)) As Last_Of_Current_Month
  , DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE())-1, 0) As First_Of_Last_Month
  , DATEADD(MONTH, DATEDIFF(MONTH, -1, GETDATE()) -1, -1) As Last_Of_Last_Month

  ,DATEADD(year, DATEDIFF(year, 0, GETDATE()), 0) As First_Of_Current_year
  , DateAdd(dd, -1, DateAdd(yy, DateDiff(yy, 0, GETDATE()) +1, 0)) As Last_Of_Current_year
  , DATEADD(YEAR, DATEDIFF(YEAR, 0, GETDATE())-1, 0) As First_Of_Last_Year
     , convert(varchar , DATEADD(Year, DATEDIFF(year, -1, GETDATE()) -1, -1), 112) as int 
  
    ,DATEADD(mm, DATEDIFF(mm, 0, GETDATE())-15, 0) as test

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edited may 21

created feb 15 18 anonymous