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Calculate Date of the week from weekending date

Posted on 2014-07-30
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Last Modified: 2014-08-08
Hi Experts!

I have a weekending date (Sunday) in column A.  I have the day of the week name in column B.  What I need in column C is the date associated for that day of the week.  

7/27/14     Mon    7/21/14
7/27/14     Tue     7/22/14
7/27/14     Wed    7/23/14
7/27/14     Thu     7/24/14
7/27/14     Fri       7/25/14
7/27/14     Sat      7/26/14
7/27/14     Sun     7/27/14

Of course I have different weekending dates in a huge data set.  It is column c that I am trying to populate.

Any help would be greatly appreciated.
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Question by:spudmcc
7 Comments
 
LVL 40

Expert Comment

by:Kyle Abrahams
ID: 40229886
I would create a function:

create function GetDateAdj
( @weekday varchar(3) 
)
returns int
as
begin 
   declare @adjust int
   select @adjust = case @weekday
      when 'Sun' then 0
      when 'Sat' then -1
      when 'Fri' then -2
      when 'Thu' then -3
      when 'Wed' then -4
      when 'Tue' then -5
      when 'Mon' then -6

return (@adjust)
end

Open in new window


then select [A], [ B], dateadd(d, [A], dbo.GetDateAdj([ B])) as C
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LVL 27

Expert Comment

by:Glenn Ray
ID: 40229900
Here are a few possible solutions:

1) Enter this formula in cell C1 and copy down:
=A1-MATCH(B1,{"Sun","Sat","Fri","Thu","Wed","Tue","Mon"},0)+1

2) Create named range ("DayList" for example) with this set of values:
={"Sun","Sat","Fri","Thu","Wed","Tue","Mon"}
then enter this formula in cell C1 and copy down:
=A1-MATCH(B1,DayList,0)+1

3) Create an actual vertical range of values anywhere in your workbook,
Sun
Sat
Fri
Thu
Wed
Tue
Mon
Highlight and name this range (again, "DayList" as an example), then use the same formula as shown in 2).

-Glenn
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LVL 40

Expert Comment

by:Kyle Abrahams
ID: 40229904
Excel . . . sorry, thought this was SQL.
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LVL 27

Accepted Solution

by:
Glenn Ray earned 500 total points
ID: 40229919
Example file attached with above formulas.
EE-DateLookup.xlsx
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Author Closing Comment

by:spudmcc
ID: 40230569
Awesome solution.  This is going to save a huge amount of time and frustration.  I so very much appreciate sharing your knowledge and time addressing this issue for me.

Much thanks!

Andy
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LVL 27

Expert Comment

by:Glenn Ray
ID: 40230671
I love helping folks save time!  That means there's time for dessert! :-)

-Glenn
0
 
LVL 50

Expert Comment

by:barry houdini
ID: 40249725
Wouldn't it be sufficient just to make C7 equal to A7 and then count back one day at a time? So that would mean just this formula in C7

=A7

and then this formula in A6 copied up

=A7-1

regards, barry
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