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.
The return type parameter is optional and can be ignored. Return_type is a number that will help you decide on which day your week should begin. Default excel will consider number one as a default value if you do not provide anything in return type. Now that means that if we do not provide anything in the return type, your week will begin from Sunday by default.
ISOWeekNum:
ISOweekNum is designed in a slightly different manner. Use the following link to check out the definition of ISO: 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.
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 an output as 53. Use these functions wisely wherever necessary.
By the end of this video, you should be able to use WeekNum and ISOweekNum functions with ease. I request you to practice as much as you can using different varieties in your function use it with the different combination or combine it with another function and see what you get.
In case of trouble or doubt, right in the comments section below.
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This applies to:
Excel 2007, Excel 2010, Excel 2013, Excel 2016, Office 365, and above
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