How to Get Week Number from Date in Excel: A Step-by-Step Guide

Learning how to get the week number from a date in Excel is a handy skill, especially if you’re dealing with scheduling, project timelines, or any data analysis involving dates. It’s a simple process using Excel’s built-in functions, and you can accomplish this task quickly with a few straightforward steps.

How to Get Week Number from Date in Excel

By following these steps, you’ll be able to determine the week number for any given date in Excel. This is useful for tracking progress and deadlines according to weeks.

Step 1: Open Excel and Select Your Date Cell

The first step is to open your Excel file and select the cell that contains the date you want to convert into a week number.

Clicking on the cell where your date is located will highlight it, making it ready for the next steps. Make sure the date is in a recognizable format like MM/DD/YYYY or DD/MM/YYYY.

Step 2: Enter the WEEKNUM Function

Next, you need to type in the formula =WEEKNUM(date).

Type =WEEKNUM( followed by selecting the cell with your date. This function will calculate the week number based on your date.

Step 3: Close the Parentheses and Press Enter

After typing the formula, close the parentheses and press Enter.

Your formula should look something like this: =WEEKNUM(A1) where A1 is the cell with your date. Hitting Enter will give you the week number for that date.

Step 4: Adjust the Cell Format If Necessary

Sometimes the cell might not display the week number correctly. Ensure it is set to a number format.

Right-click the cell, go to ‘Format Cells,’ and select ‘Number’ to make sure it displays correctly.

Step 5: Copy the Formula Down the Column (Optional)

If you have a whole column of dates, you can drag the fill handle down to apply the formula to multiple dates.

This will save you time if you have several dates that you need to convert to week numbers.

Once you’ve completed these steps, Excel will display the week number for any date you enter in the specified cell. This simple method can be a lifesaver for organizing your data.

Tips for Getting Week Number from Date in Excel

  • Ensure your dates are in a consistent and recognizable format.
  • Use the optional return_type argument in the WEEKNUM function to specify different week numbering systems (e.g., =WEEKNUM(A1, 2)).
  • Use the ISO 8601 standard with the ISOWEEKNUM function for international consistency.
  • Double-check your date formatting if the result doesn’t seem correct.
  • Use cell references in your formulas to make them dynamic and easier to update.

Frequently Asked Questions

How does the WEEKNUM function determine the week number?

The WEEKNUM function calculates the week number by counting the number of weeks between the given date and the start of the year, with the week starting on Sunday or Monday, depending on the return_type specified.

What does the return_type argument do in the WEEKNUM function?

The return_type argument allows you to choose the day on which the week starts. For example, 1 or omitted means the week starts on Sunday, while 2 means it starts on Monday.

Can I use the WEEKNUM function for historical dates?

Yes, the WEEKNUM function works for any date, past, present, or future, as long as Excel recognizes it as a valid date.

How do I handle dates that are not in a recognizable format?

Ensure your dates are in a standard format like MM/DD/YYYY. You can use Excel’s Text to Columns feature or DATEVALUE function to convert text dates into proper date formats.

Can I use the WEEKNUM function in Google Sheets?

Yes, the WEEKNUM function works similarly in Google Sheets. The syntax and functionality are almost identical, making it easy to switch between Excel and Google Sheets.


  1. Open Excel and select your date cell.
  2. Enter the WEEKNUM function.
  3. Close the parentheses and press Enter.
  4. Adjust the cell format if necessary.
  5. Copy the formula down the column (optional).


Getting the week number from a date in Excel is a quick and efficient way to manage time-sensitive data. Whether you’re planning projects, tracking deadlines, or analyzing trends, knowing how to utilize the WEEKNUM function can save you a lot of time and effort.

As you get more familiar with this function, you might also want to explore other date-related functions in Excel, like EOMONTH or NETWORKDAYS, to enhance your data management skills. Mastering these tools will not only make you more proficient in Excel but also increase your ability to handle complex data analysis tasks with ease.

If you found this guide helpful, there are plenty of other Excel tips and tricks waiting for you. Dive into the world of Excel and transform how you handle data. Happy Excel-ing!

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