- Excel Functions - Home
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- ISOWEEKNUM Function
- MINUTE Function
- MONTH Function
- NETWORKDAYS Function
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- NOW Function
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- TODAY Function
- WEEKDAY Function
- WEEKNUM Function
- WORKDAY Function
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- BINOM.DIST.RANGE Function
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- CHISQ.DIST Function
- CHISQ.DIST.RT Function
- CHISQ.INV Function
- CHISQ.INV.RT Function
- CHISQ.TEST Function
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- F.INV.RT Function
- F.TEST Function
- FISHER Function
- FISHERINV Function
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- FORECAST.ETS Function
- FORECAST.ETS.CONFINT Function
- FORECAST.ETS.SEASONALITY Function
- FORECAST.ETS.STAT Function
- FORECAST.LINEAR Function
- FREQUENCY Function
- GAMMA Function
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- LOGNORM.DIST Function
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- MAX Function
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- MEDIAN Function
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- MODE.SNGL Function
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- NORM.INV Function
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- PEARSON Function
- PERCENTILE.EXC
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- PERCENTRANK.EXC
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- PERMUT
- PERMUTATIONA
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- PROB
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- QUARTILE.INC
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- RSQ
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- SLOPE
- SMALL
- STANDARDIZE
- STDEV.P
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- STDEVA
- STDEVPA
- STEYX
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- T.DIST.RT
- T.INV
- T.INV.2T
- T.TEST
- TREND
- TRIMMEAN Function
- VAR.P Function
- VAR.S Function
- VARA Function
- VARPA Function
- WEIBULL.DIST Function
- Z.TEST Function
- Web Functions
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- ENCODEURL Function
- FILTERXML Function
- WEBSERVICE Function
Excel - ISOWEEKNUM Function
ISOWEEKNUM Function
The Excel ISOWEEKNUM function will retrieve the integer number from 1 to 52, representing the ISO week number for a specified date. This function uses the European ISO standard 8601:2000 to get the week numbering, which considers the year's first week to contain the first Thursday. It is categorized under the Date & Time functions in Excel. This function is not supported in the older version of Excel, which was first launched in Excel 2013.
Compatibility
This advanced Excel function is compatible with the following versions of MS Excel −
- Excel for Microsoft 365
- Excel for Microsoft 365 for Mac
- Excel for the web
- Excel 2024
- Excel 2024 for Mac
- Excel 2021
- Excel 2021 for Mac
- Excel 2019
- Excel 2016
- Excel 2013
Syntax
The syntax of the ISOWEEKNUM function is as follows −
=ISOWEEKNUM(date)
Arguments
You can use the following arguments with the ISOWEEKNUM function −
| Argument | Description | Required / Optional |
|---|---|---|
| Date | It specifies the date-time code, which can be used in the other formula for future calculations. | Required |
Points to Remember
- In Microsoft Excel, Dates are stored as serial numbers that ease the analyst's use in complex calculations. By default, serial number 1 indicates January 1, 1900, and serial number 40990 indicates March 3, 2012.
- If the date argument contains an invalid number, then the ISOWEEKNUM function will retrieve the #NUM! error.
- If the date argument specifies the invalid date type, then the ISOWEEKNUM function will return the #VALUE! error.
- In the older versions of Excel before Excel 2010, the ISO week number can be computed using the WEEKNUM function by setting the return_type argument to 21. For example: WEEKNUM(serial_number, 21).
How to use the ISOWEEKNUM Function in Excel?
Step-by-step explanations are depicted below −
- First, deliberate an Excel worksheet, and a list of the dates is written in the specified column.
- After that, double-click on the targeted cell and write the formula =ISOWEEKNUM("cell reference that refers to the date").
- Finally, hit the Enter to get the ISO week number.
Example of ISOWEEKNUM Function in Excel
Practice the following example to learn how to use the ISOWEEKNUM function in Excel.
How to get the ISO Week Number from Date in Excel?
This example facilitates users in obtaining the ISO week number by applying the ISOWEEKNUM function in the specific range of the cells.
Solution
Step 1 − First, consider the sample dataset, which comprises two columns named Date and ISOWEEKNUM- the independent date serial numbers are specified in the cell range B3:B6.
Step 2 − After that, select the cell range C2:C5 and write the formula =ISOWEEKNUM(C2) in the formula bar.
After that, press the "Ctrl+ Enter" to populate the results in this cell range.
Step 3 − If you wish to extract the ISO week number of today's date, write the expression =ISOWEEKNUM(TODAY()) in the C7 cell and then press the Enter tab.
Therefore, today's date is 07/01/2025, and the resulting value is 2, which denotes the current week of 2025.
Download Practice Sheet
You can download and use the sample data sheet to practice the ISOWEEKNUM function.
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