Let’s say you have daily data and your boss wants to see the trends by week of month or week of quarter? How do you calculate the week number of month or quarter? In this article, let me explain the logic and formulas we can use Excel for this.
Why calculate week in month or quarter?
Calculating “week of month” or “week of quarter” let’s us see trends by week in across months or quarters. Answering business questions like,
- How many customers we had in first of week January vs. first week of February?
- What are the total reservations in first 4 weeks of Q1 vs. first 4 weeks of Q3?
- Cumulative weekly totals for March vs. June
is easier when you have the week of month and week of quarter available in your data.
Step 1: Calculate the WEEKNUM in year
Before we can calculate the weeknum in a month or quarter, we need to do two other important calculations. The first one of them is WEEKNUM in year.
Add a column adjacent to your data and use the below formula to calculate the weeknumber in year.
=WEEKNUM(B4,2)This assumes your date is in the cell B4 and your week begins on Monday. If you want to do the analysis from SUNDAY start, just use =WEEKDAY(B4)
Step 2: Calculate the MONTH number
Our next formula is to figure out which month we are in. Add another column adjacent to your data and use this formula.
=MONTH(B4)At this stage your data should look like this:
Step 3: Calculate Week in Month
Now that we know the “week in year” and “month number”, we can easily calculate the week in month using below formula.
=D4-WEEKNUM(DATE(YEAR(B4),E4,1),2)+1How this “week in month” formula works?
- D4 has the weeknumber in year
- E4 has the month number
- DATE(YEAR(B4),E4,1) tells us the first date of the month (for example, all dates in JAN 2024 will have this as 1-Jan-2024)
- WEEKNUM(DATE(YEAR(B4),E4,1),2) will give us the weeknumber for that date (with Monday start)
- D4-WEEKNUM(DATE(YEAR(B4),E4,1),2)+1 finally tells us the weeknumber of the month (we need to add +1 so that the first week of month will be 1 instead of 0)
[Optional] Step 4: Formula for Week in Quarter
If you need to calculate the “Week in Quarter” for some analysis, you can use the below formula to do that.
=D4-WEEKNUM(DATE(YEAR(B4),INT((E4-1)/3)*3+1,1),2)+1How this “week in quarter” formula works?
- D4 has the weeknumber in year
- E4 has the month number
- INT((E4-1)/3)*3+1 calculates the first month of the quarter (so months 1,2,3 ? 1, 4,5,6 ? 4 … )
- DATE(YEAR(B4),INT((E4-1)/3)*3+1,1) tells us the first date of the quarter (for example, all dates in JAN, FEB, MAR 2024 will have this as 1-Jan-2024)
- WEEKNUM(DATE(YEAR(B4),INT((E4-1)/3)*3+1,1),2) will give us the weeknumber for that date (with Monday start)
- D4-WEEKNUM(DATE(YEAR(B4),INT((E4-1)/3)*3+1,1),2)+1 finally tells us the weeknumber of the quarter (we need to add +1 so that the first week of quarter will be 1 instead of 0)
What if I want Sunday Week Start?
If your week starts on Sunday, you can use the below formulas instead.
'For Week in year
=WEEKNUM(B4)
'For Month number
=MONTH(B4)
'For week in month
=D4-WEEKNUM(DATE(YEAR(B4),E4,1))+1
'For week in quarter
=D4-WEEKNUM(DATE(YEAR(B4),INT((E4-1)/3)*3+1,1))+1For weeks beginning on other days (such as Friday start)
You just need to pass the type of week start to the WEEKNUM() function. Refer to below table to find what you need to use.
Download Sample File with Weeknumber Formulas
If you are having trouble implementing the formulas, refer to free example workbook. It has all the formulas for,
- Calculating week number in year
- Month number
- Week of month
- Week of quarter
In conclusion…
Calculating “week of month” and “week of quarter” is relatively simple and easy process with Excel. Once you have the values in your data, you can use them to better understand the trends across months or quarters. If you have the data in a table, then applying and maintaining these formulas is easy too, as Excel tables auto-extend the formulas for all cells.
Few additional tips to take this idea further:
- Integrate these calculations into Power Query: If you are bringing external data into Excel through Power Query, try adding these columns with Power Query “Add column” feature. Learn more about Power Query here.
- Use a separate calendar table: If you have too many rows of transactional data (like tickets or sales), then instead of calculating the week number for every row, use a calendar table and do the calculations there. After that use “data modeling” feature of Excel to link calendar table to your transactional data. This way you can combine data from both tables in your pivot reports. Learn more about calendar tables and data modeling feature.
Other ways to work with dates
Please refer to these tutorials and examples to solve other date problems in Excel.
40 Responses to “Looking up when the data won’t co-operate (case study)”
Nice Trick.. Clever use of cell references
Here is a formula I tried to create:
=SUMPRODUCT(((NOT(ISERROR(SEARCH(L5,B4:H14))))*1),(B5:H15))
It takes care of Caveat #1 (can handle text), but Caveat #2 remains.
In situations like this, I will often use VBA to restructure the data (2 columns: dates and values) on to a new worksheet. I can then use this 'clean' source for data analysis (formula or pivot table).
=SUMPRODUCT(((NOT(ISERROR(SEARCH(L5,B4:H14))))*1),(B5:H15)) and complex formulae in general are all very well but when you come back to them in a few weeks / months time, it is not at all easy to see what they do and what the limitations are.
Hi Chandoo,
I had used this type of cell ref. various times while calculating average.
But for the situation here try below formula . Note this is an array formula and must be confirmed with Ctrl+Shift+Enter.
=SMALL(IF(MMULT((L5=B4:H14)*IF(ISNUMBER(B5:H15),B5:H15),{1;1;1;1;1;1;1}),MMULT((L5=B4:H14)*IF(ISNUMBER(B5:H15),B5:H15),{1;1;1;1;1;1;1})),1)
Regards,
Hi, I think Using SEARCH in here will create a problem say there is a text like SUN and another text SUNLIGHT both result will be added by SUMPRODUCT.
Regards,
Array option.
=SUM(IF(MOD(ROW(B4:B14),2)=MOD(ROW(B4),2),IF(B4:H14=L5,B5:H15)))
Regards
@Elias,
Nice approach.
Although not requested - the formula I suggested closes all possibilities.
Criteria: _____ Value to retrieve:
Date__________ Numeric
Date__________Textual
Textual________Numeric
Textual________Textual
While your formula copes with only the 3 first combinations.
Michael (Micky) Avidan
“Microsoft® Answer” – Wiki author & Forums Moderator
“Microsoft®” MVP – Excel (2009-2015)
ISRAEL
@Michael,
Sorry but I don’t understand your point. I believe the challenge was to return the summary of a given date. What is your really volatile formula doing that mine is not?
Regards
@Elias,
I didn't say that the challenge differs from what you just mentioned/aimed to nor that your formula doesn't provide the requested result.
Please read my previous comment again and focus on the last combination (TEXT / TEXT).
I, myself, always try to provide a global Formula that is capable to handle all sorts of data.
Michael (Micky) Avidan
“Microsoft® Answer” – Wiki author & Forums Moderator
“Microsoft®” MVP – Excel (2009-2015)
ISRAEL
@Michael,
I see your point, but you are missing the below points if you are trying to cover all sorts of data.
What happened if the lookup value does not exist?
Do you want the first, second, summary, concatenation of the values if the look value is repeated?
See they are too many possibilities to be cover with just one formula.
Regards
1) The range: B4:H15 was named: RNG.
2) The following Array Formula was "retrieved from my sleeve" and I hope it can be shorten.
3) The formula seems to take care of BOTH(!) caveats.
-------------------------------------------------------------------------------
=OFFSET(INDIRECT(ADDRESS(SMALL(IF(RNG=L5,ROW(RNG),""),1),MOD(SMALL(IF(RNG=L5,(ROW(RNG))+COLUMN(RNG)/10),1),1)*10)),1,)
-------------------------------------------------------------------------------
Michael (Micky) Avidan
“Microsoft® Answer” – Wiki author & Forums Moderator
“Microsoft®” MVP – Excel (2009-2015)
ISRAEL
@Michael,
Check what happened with your result if you type 41927 in D5.
Regards
Correct. Didn't predict that.
Will find time to work something out.
Michael (Micky) Avidan
“Microsoft® Answer” – Wiki author & Forums Moderator
“Microsoft®” MVP – Excel (2009-2015)
ISRAEL
@Elias,
Let's hope the following Array Formula "closes all open doors".
Again - it has nothing to do with your formula which works fine as long as the 3 first mentioned combinations are concerned.
-------------------------------------------------------------------------------
=INDEX(RNG,LARGE(IF(RNG=L5,MOD(ROW(RNG)-1,2)*(ROW(RNG)),""),1)-2,(MOD(SMALL(IF(RNG=L5,(ROW(RNG))+COLUMN(RNG)/10),1),1)*10)-1)
-------------------------------------------------------------------------------
Michael (Micky) Avidan
“Microsoft® Answer” – Wiki author & Forums Moderator
“Microsoft®” MVP – Excel (2009-2015)
ISRAEL
Ok, if you insist. The following will cover all the scenarios you listed. However, I’ll never recommend/use such of formula.
Defined names:
rDat = $B$4:$H$15
rRow =ROW(rDat)-MIN(ROW(rDat))+1
rCol =COLUMN(rDat)-MIN(COLUMN(rDat))+1
rInc =MOD(rRow,2)=MOD(MIN(rRow),2)
L6=INDEX(rDat,MAX(IF(rInc,IF(rDat=L5,rRow)))+1,MAX(IF(rInc,IF(rDat=L5,rCol))))
Array Enter
Regards
@Michael,
unfortunately, your array formula still seems to return wrong results (eg 3-Nov).
If data are organized like in the example, ie. looks like a calendar, the INDEX formula seems quite simple:
=INDEX($B$4:$H$15,ROUNDDOWN((L5-B4)/7,0)*2+2,MOD((L5-B4),7)+1)
Yours is effectively the same as what I just came up with, and I believe this is the optimal answer to this particular problem.
My solution, before I saw yours:
=OFFSET(B5,QUOTIENT(L5-B4,7)*2,MOD(L5-B4,7))
OFFSET will work for an arbitrary list size, but INDEX might be easier to read.
QUOTIENT does the round and division in a single step.
If there's an improvement over Elias's solution then I for one can't see it.
Perhaps a non-CSE version which would also mean that only two references (B4:H14 and B5:H15), as opposed to three (B4, B4:B14 and and B5:H15), would require manually amending should the data range change, i.e.:
=SUMPRODUCT((ISEVEN(ROW(B4:H14)-MIN(ROW(B4:H14)))*(B4:H14=L5)*B5:H15))
I suppose we could make it a single, uniform range reference:
=SUMPRODUCT((ISEVEN(ROW(B4:H14)-MIN(ROW(B4:H14)))*(B4:H14=L5)*OFFSET(B4:H14,1,,,)))
which might be more appropriate should we e.g. wish to use a Defined Name for our range, i.e.:
=SUMPRODUCT((ISEVEN(ROW(Rng)-MIN(ROW(Rng)))*(Rng=L5)*OFFSET(Rng,1,,,)))
though whether that compensates for the extra, volatile function call is something to be debated.
Regards
I have tried something and then my Excel workbooks got shut down. Maybe that was too much?
Anyway here is what I've tried:
=SUMPRODUCT(INDEX(B5:H15;IF(ISEVEN(ROW(B5:H15));ROW(B5:B15)-ROW(B5)+1);{1\2\3\4\5\6\7}))
Guess that was wrong? Would this approach work anyway?
Looking forward to learn something from you Excel Experts.
Sorry, I haven't took notice of XOR LX's answer. I guess that's kind of what I was looking for.
@Michael Avidan
As it stands that is not a very rigorous construction.
You say "I, myself, always try to provide a global Formula that is capable to handle all sorts of data", which is a wonderful philosophy, but isn't it at least as important that we ensure that our formulas are independent of the row and column references of the data range in question, so that, should that range change, we do not have to re-work our solution?
What happens with your formula, for example, if RNG is instead re-located one row down, from B4:H15 to B5:H16?
When a formula is reliant upon the addition/subtraction of certain constants within the formula, which themselves are necessarily dependent upon the specific rows/columns in which the data lies at any given time (e.g. the -1 in MOD(ROW(RNG)-1,2)), then that formula is not a very flexible one.
Hence the reason for my choice of a slightly longer construction:
ROW(B4:H14)-MIN(ROW(B4:H14))
which ensures that this part of the calculation is not dependent upon the precise location of the data range within the worksheet, and so will give correct answers even if that range is re-located.
Regards
{=OFFSET(B4,MAX((B4:H15=L5)*ISODD(ROW(1:12))*ROW(1:12)),MAX((B4:H15=L5)*ISODD(ROW(1:12))*COLUMN(A:G))-1)}
Non-array formula:
=INDEX(B4:H15,SUMPRODUCT((B4:H15=L5)*(ROW(B4:H15)-ROW(B4)+1)*ISODD(ROW(B4:H15)-ROW(B4)+1))+1,SUMPRODUCT((B4:H15=L5)*(COLUMN(B4:H15)-COLUMN(B4)+1)*ISODD(ROW(B4:H15)-ROW(B4)+1)))
Using one range (B4:H15), one reference (B4), one lookup value (L5) and no INDIRECT or OFFSET.
My trial with defined names:
DateRange
=$B$4:$H$4,$B$6:$H$6,$B$8:$H$8,$B$10:$H$10,$B$12:$H$12,$B$14:$H$14
Position
=RANK('lookup problem'!$L$5,DateRange,1)
L6
=OFFSET(B4,ROUNDUP(Position/7,0)*2- 1,IF(MOD(Position,7)=0,6,MOD(Position,7)-1))
I'd probably just run with something like:
=SUMPRODUCT((B4:H14=L5)*(MOD(ROW(B4:H14),2)=MOD(ROW(B4),2))*B5:H15)
...which is basically the same as Elias' but without the IFs
The opposite of elegant but it works...
=INDEX(B4:H15,IFERROR(MATCH(L5,B4:B14,0),0)+IFERROR(MATCH(L5,C4:C14,0),0)+IFERROR(MATCH(L5,D4:D14,0),0)+IFERROR(MATCH(L5,E4:E14,0),0)+IFERROR(MATCH(L5,F4:F14,0),0)+IFERROR(MATCH(L5,G4:G14,0),0)+IFERROR(MATCH(L5,H4:H14,0),0)+1,IFERROR(MATCH(L5,B4:H4,0),0)+IFERROR(MATCH(L5,B6:H6,0),0)+IFERROR(MATCH(L5,B8:H8,0),0)+IFERROR(MATCH(L5,B10:H10,0),0)+IFERROR(MATCH(L5,B12:H12,0),0)+IFERROR(MATCH(L5,B14:H14,0),0))
=INDEX(B4:H15,
IFERROR(MATCH(L5,B4:B14,0),0)+
IFERROR(MATCH(L5,C4:C14,0),0)+
IFERROR(MATCH(L5,D4:D14,0),0)+
IFERROR(MATCH(L5,E4:E14,0),0)+
IFERROR(MATCH(L5,F4:F14,0),0)+
IFERROR(MATCH(L5,G4:G14,0),0)+
IFERROR(MATCH(L5,H4:H14,0),0)+1,
IFERROR(MATCH(L5,B4:H4,0),0)+
IFERROR(MATCH(L5,B6:H6,0),0)+
IFERROR(MATCH(L5,B8:H8,0),0)+
IFERROR(MATCH(L5,B10:H10,0),0)+
IFERROR(MATCH(L5,B12:H12,0),0)+
IFERROR(MATCH(L5,B14:H14,0),0))
Named Range
rownum = SUMPRODUCT(('lookup problem'!$B$4:$H$14='lookup problem'!$L$5)*ROW('lookup problem'!$B$4:$H$14)*ISEVEN(ROW('lookup problem'!$B$4:$H$14)))
Formula
=OFFSET($A$1,rownum,MATCH(L5,INDIRECT("$B"&rownum&":$H"&rownum),0))
How about SUM(IF(B4:H14=L5,B5:H15)) with array..it should work
Sorry, Chandoo, you can't find stuff this way in every possible scenario.
What if 2014-10-01 sales would equal 41.927 ? Which is serial number for 2014-10-15 ? SUMIF would fail to retrive correct answer. And your example data suggest that such number is possible in your table.
It's better not to search through dates and numbers at the same time.
If I'd solve a problem like this, it'd reformat table first so I get one column with dates and the other with numbers.
In this case, formula to form date column would be:
=INDIRECT(ADDRESS((INT((ROW()-4)/COUNT($B$4:$H$4))+1)*2+2;MOD(ROW()-4;COUNT($B$4:$H$4))+2;4;1))
and numbers would be the same formula with sight adjustment (+3 instead of +2 at the end of first argument):
=INDIRECT(ADDRESS((INT((ROW()-4)/COUNT($B$4:$H$4))+1)*2+3;MOD(ROW()-4;COUNT($B$4:$H$4))+2;4;1))
And now you got two columns that you can safely use for searching!
Oops, sorry, you actually mentioned that it doesn't work if number=date! I missed that part 🙁
={OFFSET(A1,SUM((B4:H14=L5)*ROW((B4:H14))),SUM((B4:H14=L5)*COLUMN((B4:H14)))-1)}
Works for all data... the solution I got for indirect looks little lengthy
I want to count last 20 records of a person, whose marks is greater than 2 and grade "manager". ....
Assume A1 has got names (James, John...etc...)
A2 "Manager"
A3 "2"
Someone please reply
I want to count last 20 records of a person, whose marks is greater than "2" and grade "Manager"
Assume A1 "geroge" A2 "Michael" A3 "George" etc...name can found anywhere in the rows
B1 "Manager" B2" clerk"
C1 "2" C2, "4"
please reply
Simplest I can come up with. No limitations for either 1 or 2. This does assume dates are an ordered list with 7 per row, and 2 rows per set. Assuming this is always true this will work for an arbitrary long list of dates.
=OFFSET(B5,QUOTIENT($L$5-$B$4,7)*2,MOD($L$5-$B$4,7))
@Marc,
Nice approach - however, as there are no "Negative Dates" - try:
=OFFSET(B5,INT(L5-B4)/7)*2,MOD(L5-B4,7))
——————————————————————————-
Michael (Micky) Avidan
“Microsoft® Answer” – Wiki author & Forums Moderator
“Microsoft®” MVP – Excel (2009-2015)
ISRAEL
=OFFSET(B4,ROUNDUP((L5-41911+1)/7,0)*2-1,MOD(L5-41911,7))
B4 has been used as reference cell for OFFSET().
FOR ROWS:
ROUNDUP(....,0) gives the integer value of a division. In case of presence of a remainder, ROUNDUP will add 1 to the Quotient.
As opposed to ROUNDUP(), the INT() or QUOTIENT() functions eliminate the remainder.
41911 = 01-Sept-2014, the first date in the data.
*2 has been used because there are 2 columns per set of data.
/7 has been used because there are 7 columns per set of data.
For columns
MOD(L5-41911,7))
Vijaykumar Shetye,
Panaji, Goa, India
This is how i did it
{=INDEX(B4:H15, MAX((L5=B4:H15)*ROW(B4:H15))-2, MAX((L5=B4:H15)*COLUMN(B4:H15))-1 )}
Here's my solution:
=INDEX(B4:H15,MATCH(1,MMULT(--(B4:H15=L5),TRANSPOSE(COLUMN(B4:H15)^0)),0)+1,MATCH(1,MMULT(TRANSPOSE(--(B4:H15=L5)),ROW(B4:H15)^0),0))
Sorry, forgot to mention Ctrl Shift Enter is needed.