Puzzeling results from calculate number of weeks functions

Or even:

Formula:

Please Login or Register  to view this content.

which returns 2.

I think it depends on your interpretation, or even what you need to do with it. For example, do you want to round up or down if you get a partial week? In other words, full weeks elapsed or "worst case" for planning purposes. Clearly, most calculations will return some full weeks and part of a week.

The calculation will, of course, depend on today's date.

Regards, TMS

	A	B	C	D	E
1
2	If cell B4 contains "r" , C4 should be the number of weeks which have passed since the date from A4
3
4	07/10/2014	R	3.00	Weeks	=IF(B4="r",WEEKNUM(TODAY(),2)-WEEKNUM(A4,2)+1,"")
5
6			2.00	Weeks	=IF(B4="r",ROUND((((YEAR(TODAY())-YEAR(A4))*365+DAY(TODAY())-DAY(A4))/7),1),"Error")
7
8			3.00	Weeks	=IF(B4="r",IF((YEAR(A4)=YEAR(TODAY()))*(TODAY()>=A4),WEEKNUM(TODAY(),2)-WEEKNUM(A4,2)+1,IF(YEAR(A4)<YEAR(TODAY()),(WEEKNUM(DATE(YEAR(A4),12,31),2)-WEEKNUM(A4,2))+WEEKNUM(TODAY(),2))),"")
9
10			2.00	Weeks	=IF(B4<>"R","",DATEDIF(A4,TODAY(),"d")/7)
11

If I set the date in cell A4 to 07.10.2014 the 3 formula return; C4 = 3, C6 = 2 and C8 = 3.

If I set the date in cell A4 to 14.10.2014 the 3 formula return; C4 = 2, C6 = 1 and C8 = 2.


If I set the date in cell A4 to 08.10.2014 the 3 formula return; C4 = 3, C6 = 1.9 and C8 = 3.


If I set the date in cell A4 to 07.10.2013 the 3 formula return; C4 = 3, C6 = 53.1 and C8 = 54.

Is this what others are seeing?

	A	B	C	D	E	F	G
12	Date		1	2	3	4
13	06/10/2014	R	3.00	2.10	3.00	2.14
14	07/10/2014	R	3.00	2.00	3.00	2.00
15	14/10/2014	R	2.00	1.00	2.00	1.00
16	08/10/2014	R	3.00	1.90	3.00	1.86
17	07/10/2013	R	3.00	54.10	55.00	54.14
18

Regards, TMS

You're welcome.



If you are satisfied with the solution(s) provided, please mark your thread as Solved.


New quick method:
Select Thread Tools-> Mark thread as Solved. To undo, select Thread Tools-> Mark thread as Unsolved.

Or you can use this way:

How to mark a thread Solved
Go to the first post
Click edit
Click Go Advanced
Just below the word Title you will see a dropdown with the word No prefix.
Change to Solved
Click Save


You may also want to consider thanking those people who helped you by clicking on the little star at the bottom left of their reply to your question.

20 posts in that thread and nobody actually defined "the number of weeks passed"

Once that simple question is answered the solution is trivial (unless you have a very convoluted definition of number of weeks passed).....and it won't involve using WEEKNUM function

Well, he says:

I need to calculate the number of weeks which have passed since a certain day for Project Planning.

But that doesn't say whether he wants whole or fractional weeks or, if whole weeks, whether to round up or down ... so, whole weeks passed, or whole weeks including the current week.

He seemed happy with the outcome, but I'm not sure which of the solutions was the one he wanted.

Regards, TMS