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:

Formula is too complicated to remember? Save the formula as an Auto Text entry for reusing with only one click in future! Read more…     Free trial

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:

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?