This post will guide you how to use Excel WEEKNUM function with syntax and examples in Microsoft excel.
The Excel WEEKNUM function returns the week number of a specific date, and the returned value is ranging from 1 to 53. And this function will start to count the week number from January 1 and the Sunday is the first day in one week by default.
The WEEKNUM function is a build-in function in Microsoft Excel and it is categorized as a DATE and TIME Function.
The WEEKNUM function is available in Excel 2016, Excel 2013, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000, Excel 2011 for Mac.
The syntax of the WEEKNUM function is as below:
Where the WEEKNUM function arguments is:
- Serial_number –This is a required argument. An Excel date that you want to get the week number. The dates should be typed by the DATE function to make sure it is a valid Excel date. For example, use DATE(2018,3,20) to pass into the WEEKNUM function and then it will return the week number.
- return_type – This is an optional argument. A number that determines the first day of the week for the year, the default value is 1.
|Return_type||Week begins on||System|
|1 or omitted||Sunday||1|
- If serial_number is out of range for the current date base value, a #NUM! Error is returned.
- If return_type is out of the range specified in the table above, a #NUM! Error is returned.
- A serial date is how the Microsoft Excel stores dates and it represents the number of days since 1900-01-01, so the January 1, 1900 date is serial number 1 by default.
Excel WEEKNUM Function Examples
The below examples will show you how to use Excel WEEKNUM Function to return the week number from an Excel date.
1# get number of the week from a date value 2018/03/20, enter the following formula in Cell B1.
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