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How to convert week number to date or vice versa in Excel?

Is there a way to get the week number from a given date or extract the date range from a specific week number and year in Excel? To solve this task, the following formulas may do you a favor.

Convert week number to date with formulas

Convert date to week number with formulas

Convert week number to date with formulas

Supposing I have a random year and week number which are 2015 and 15 in a worksheet as following screenshot shown, and now I want to find out the specific dates from Monday to Sunday by this given week number.

To calculate the date range by the specific week number, you can use the following formulas:

1. Select a blank cell you will return the start date (in our case we select the Cell B5), enter the formula: =MAX(DATE(B1,1,1),DATE(B1,1,1)-WEEKDAY(DATE(B1,1,1),2)+(B2-1)*7+1), and press the Enter key. See screenshot below:

2. Select another blank cell you will return the end date (in our case we select the Cell B6), enter =MIN(DATE(B1+1,1,0),DATE(B1,1,1)-WEEKDAY(DATE(B1,1,1),2)+B2*7), and press the Enter key. See screenshot below:

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Note: In both formulas above, B1 contains a year and B2 is a specified week number, you can change the arguments to your need).

3. As you see, both formulas return numbers instead of dates. Keep selecting both calculating results, and click Home > Number Format box > Short Date to change the numbers to dates. See screenshot below:

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Convert date to week number with formulas

On the other hand, you can also apply the WEEKNUM function to convert a date to corresponding week number.

1. Select a blank cell you will return the week number, enter this formula: =WEEKNUM(B1,1), and press the Enter key. See screenshot:

Notes:

(1) In above formula, B1 contains the date that you want to use.

(2) If you need to return the week number from a date which begins in Monday, please apply this formula: =WEEKNUM(B1,2).

Related articles:

How to count the number of specific weekdays between two dates in Excel?

How to add / subtract days / months / years to date in Excel?

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Comments (23)
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Long
Long
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All of these formulas have issues when the date is in the last week of the year. They don't give the correct date for Monday of the last week.
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nair.srijith@gmail.com
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I find this better "Start of week"
B5=(8-WEEKDAY(DATE(B1,1,1),1))+((B2-2)*7)+DATE(B1,1,1)

8-WEEKDAY(DATE(B1,1,1),1) => find the no. of days in a week for first week of the year
(B2-2)*7 => calculate the number of days excluding the first week of year and the week for which calculation is being done
Then add these 2 to the first day of the year to get first day of the desired week


Then "End of week",
B6=B5+6

PS:
Week starts on Sunday
For weeks starting on Monday, use this instead:
B5=(8-WEEKDAY(DATE(B1,1,1),2))+((B2-2)*7)+DATE(B1,1,1)
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Fabian
Fabian    
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Your formula works perfectly for every year. End of week would be B6=B5+6 though. Thanks a lot!
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nair.srijith@gmail.com
    Fabian
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Thanks. Will correct that...
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Ryan
Ryan
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This formula is overly complicated. If you have a date say 8/17/2021 in Cell A1, to get the Week Ending(as of Saturday) you just need the following: = A1-WEEKDAY(A1,1)+7This will return 8/21/2021. Date of 12/30/2020 will return 1/2/2021 as week ending.
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GILLY2801
GILLY2801
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Hi,

not sure if this has been asked, but essentially, I want to be able to drag the date and the week number automatically fill beside it when I do that.

Can anyone help?

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Mikeman145
Mikeman145     GILLY2801
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@gilly2801 you can use an array formula for example with "=weeknum(C2:C)" press command shift enter and it will turn it into an array function.
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Biswajit
Biswajit
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Hi please help me.

Suppose we are considering Date 1 to 7 is week 1 and 8 to 14 is week 2. Can you please help me out how can i use if function to calculate week. I have tried but not able to get the correct result.
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nair.srijith@gmail.com
    Biswajit
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=ROUNDUP((TODAY()-DATE(YEAR(TODAY()),1,1))/7,0)
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Srijith
Srijith     Biswajit
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=ROUNDUP((TODAY()-DATE(YEAR(TODAY()),1,1))/7,0)
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jtaylorg91
jtaylorg91
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Thank YOU!!!!
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geoffsmile
geoffsmile
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Thank you very much!


=CONCATENATE("Inclusive Dates: ",TEXT(MAX(DATE(TEXT(TODAY(),"yyyy"),1,1),DATE(TEXT(TODAY(),"yyyy"),1,1)-WEEKDAY(DATE(TEXT(TODAY(),"yyyy"),1,1),2)+(WEEKNUM(TODAY())-1)*7+1),"MMMM")," ",TEXT(MAX(DATE(TEXT(TODAY(),"yyyy"),1,1),DATE(TEXT(TODAY(),"yyyy"),1,1)-WEEKDAY(DATE(TEXT(TODAY(),"yyyy"),1,1),2)+(WEEKNUM(TODAY())-1)*7+1),"DD"),", ",TEXT(MAX(DATE(TEXT(TODAY(),"yyyy"),1,1),DATE(TEXT(TODAY(),"yyyy"),1,1)-WEEKDAY(DATE(TEXT(TODAY(),"yyyy"),1,1),2)+(WEEKNUM(TODAY())-1)*7+1),"YYYY")," - ",TEXT(MIN(DATE(TEXT(TODAY(),"yyyy")+1,1,0),DATE(TEXT(TODAY(),"yyyy"),1,1)-WEEKDAY(DATE(TEXT(TODAY(),"yyyy"),1,1),2)+WEEKNUM(TODAY())*7),"MMMM")," ",TEXT(MIN(DATE(TEXT(TODAY(),"yyyy")+1,1,0),DATE(TEXT(TODAY(),"yyyy"),1,1)-WEEKDAY(DATE(TEXT(TODAY(),"yyyy"),1,1),2)+WEEKNUM(TODAY())*7),"DD"),", ",TEXT(MIN(DATE(TEXT(TODAY(),"yyyy")+1,1,0),DATE(TEXT(TODAY(),"yyyy"),1,1)-WEEKDAY(DATE(TEXT(TODAY(),"yyyy"),1,1),2)+WEEKNUM(TODAY())*7),"YYYY"))
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seld
seld
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Date(2017;1;7 * weeknumer - 5) 5 monday, 4 tuesday... :)
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Katy
Katy     seld
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Or to make in not specific to the year 2017...
=DATE(YEAR,1,7 * WEEKNUM - WEEKDAY(DATE(YEAR,1,7) - 2))

2 monday, 3 tuesday,...
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Lynnwood
Lynnwood
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I'm sorry folks, but I could neither understand nor make work any of the formulas above so I finally figured out the following solution: DATE(B1,1,1)+($A4×7)−(6−(7−WEEKDAY(DATE(B1,1,1),first-day))) The first part "DATE(B1,1,1)+(B2×7)" simply takes January 1 of the year and adds the number of weeks. The next part calculates how many days to subtract from the WEEKDAY of January 1 to get the first day of the week. This is what I finally figured out: 6−(7−WEEKDAY(DATE(B1,1,1),first-day)) If, for example, January 1 falls on a Sunday (day 7), then this formula become "6-(7-7)" or simply 6 - which is the number of days you need to subtract to get Monday of that week. Try other days. Finally, if you want to find any other day of the week, just add the WEEKDAY number minus 1 to this result. So the last day of the week (Sunday) is: DATE(B1,1,1)+($A4×7)−(6−(7−WEEKDAY(DATE(B1,1,1),first-day)))+(7−1) Which can be simplified to: DATE(B1,1,1)+($A4×7)−(12−(7−WEEKDAY(DATE(B1,1,1),first-day))) Wednesday would be: DATE(B1,1,1)+($A4×7)−(8−(7−WEEKDAY(DATE(B1,1,1),first-day))) etc. I hope this helps someone else who needs this both with a workable solution along with a bit of understanding of how it was arrived at!
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TJ
TJ
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It's a great formulas and ideal! However, it's important to point out that Excel default system week number counts from Sunday to Saturday. Adjustment is needed if the week number is extracted from Excel Weeknumber formulas.
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