Excel WeekNum and ISOWeekNum Functions. In this video, we will learn about how to use WeekNum and ISOWeekNUm Excel Functions. These functions are designed to help you extract the number of a week from a given date. Using this week numbers you can organize your data more efficiently.

These numbers would help you manage your transactions data orders data sales data attendance information and much more in a very easy to navigate format.

WeekNum

Excel WeekNum function will provide you information about a week number by taking in two parameters, “Serial_number and a “Return_type”.

The serial number has to be a date and cannot be a text value in order to operate the function properly. If you pass in a text value a problem can occur and the results may not be accurate or may result in an error. You should pass the value for the serial number using a date function or you should provide a reference to a cell that has a proper date in it.

ISOWeekNum

ISOweekNum is designed in a slightly different manner. Use the following link to check out the definition of ISO: http://bit.ly/2laUw65

ISO week now will provide you information about the week number using a slightly different approach i.e. If a week 1 starts from the middle of the week where half of the week is the last week of the last year and half of the week is the first week of the beginning year that week will be considered as the last week of the previous year.

Click on the following button to download the file used in the demo to practice along with us.

As demonstrated in the video, the first week of 2016 is actually a part of the last week of 2015 and that is the reason when using ISOweekNum we got output as 53. Use these functions wisely wherever necessary. In case of trouble or doubt, right in the comments section below.

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Excel Learning Series – TOC

1. Excel 2016 – Basics – Find Sum, Average, Min and Max
2. Excel 2016 Difference Between Formulas and Functions
3. Excel 2016 Copy Formulas or Functions
4. Microsoft Excel Auto Fill
5. Excel 2016 Manage Views using Freeze Panes
6. Microsoft Excel – Saving Workbooks
7. Excel Upper and Lower Text Functions
8. Excel 2016 – Text Function – Proper
9. Excel Text Functions – Trim Function
10. Excel – Text Function Left Function
11. Excel Text Function – Right Function
12. Excel Text Functions – MID Function
13. Excel Concatenate Text Function
14. Excel Nested Functions
15. Excel Search Function
16. Excel – Calculate Age using Date Function Today
17. Calculate Tenure in Excel with Days Function
18. Autofill Dates in Excel
19. Formatting Dates in Excel
20. Excel Date Format Shortcut
21. Calculating Sum of Time in Excel
22. Calculate Expiry Date in Excel 2016 – EDATE
23. Find Age or Tenure using DATEDIF in Excel 2016
24. RandBetween – Generate Random Dates in Excel 2016
25. Excel Weekday Function
26. Excel WeekNum and ISOWeekNum Functions
27. Excel Networkdays and Excel Networkdays.INTL
28. Excel Workday and Workdays INTL Functions
29. Excel DATEVALUE AND TIMEVALUE
30. Calculate Time Difference in Excel
31. Calculate Quarter in Excel
32. Rounding Day, Hour and Minutes in Excel

We hope you find this article/Demonstration useful. In case you are stuck and or need help, feel free to drop a comment below or submit your question. Do share it further and add your feedback about the article in the comments section.