Please Note: This article is written for users of the following Microsoft Excel versions: 2007, 2010, 2013, 2016, 2019, Excel in Microsoft 365, and 2021. If you are using an earlier version (Excel 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Excel, click here: Calculating the Day of the Year.

Calculating the Day of the Year

Written by Allen Wyatt (last updated September 23, 2023)
This tip applies to Excel 2007, 2010, 2013, 2016, 2019, Excel in Microsoft 365, and 2021


You've probably seen it on calendars before—some include an indication that "Today is the 123 day of the year with 242 remaining." You can easily calculate the day number of a year, as well as how many are remaining. For instance, let's assume you have a date in cell D27. You could use the following formulas to calculate, respectively, what day of the year it is and how many are still left:

=TRUNC(D27)-DATE(YEAR(D27)-1,12,31)
=DATE(YEAR(D27),12,31)-TRUNC(D27)

Using these formulas, the result of 1/1/2023 in cell D27 would be 1 and 364, respectively, meaning it is the first day of the year. (This is as it should be.)

Of course, once you enter the formulas, you need to format the cells as regular numbers. (Excel will, by default, try to format the cells as dates.) With the two cells selected, follow these steps:

  1. Display the Home tab of the ribbon.
  2. Click the small icon at the lower-right corner of the Number group. Excel displays the Format Cells dialog box.
  3. Make sure the Number tab is selected.
  4. In the Category list, choose Number. (See Figure 1.)
  5. Figure 1. The Number tab of the Format Cells dialog box.

  6. Make sure the Decimal Places option is set to 0.
  7. Click on OK.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (8727) applies to Microsoft Excel 2007, 2010, 2013, 2016, 2019, Excel in Microsoft 365, and 2021. You can find a version of this tip for the older menu interface of Excel here: Calculating the Day of the Year.

Author Bio

Allen Wyatt

With more than 50 non-fiction books and numerous magazine articles to his credit, Allen Wyatt is an internationally recognized author. He is president of Sharon Parq Associates, a computer and publishing services company. ...

MORE FROM ALLEN

Formatting Footnote and Endnote References

Depending on whom you are writing for, you may want your footnote and endnote references to appear a specific way. Word ...

Discover More

Deleting Every X Rows without a Macro

Grab some info from a source other than Excel, and you may find the need to delete a certain pattern of rows from a ...

Discover More

Easily Running a Program as the Administrator

In order to run some programs properly in the Windows environment, you'll need to do so using administrator privileges. ...

Discover More

Excel Smarts for Beginners! Featuring the friendly and trusted For Dummies style, this popular guide shows beginners how to get up and running with Excel while also helping more experienced users get comfortable with the newest features. Check out Excel 2013 For Dummies today!

More ExcelTips (ribbon)

Using the WEEKNUM Function

Need to know which week of the year a particular date falls within? Excel provides the WEEKNUM function so you can easily ...

Discover More

Using the EOMONTH Function

If you need to determine the date of the last day in a month, it's hard to beat the flexibility of the EOMONTH function. ...

Discover More

Using the UNIQUE Function

The UNIQUE function can be used to evaluate a range and return the unique values in that range. Understanding how the ...

Discover More
Subscribe

FREE SERVICE: Get tips like this every week in ExcelTips, a free productivity newsletter. Enter your address and click "Subscribe."

View most recent newsletter.

Comments

If you would like to add an image to your comment (not an avatar, but an image to help in making the point of your comment), include the characters [{fig}] (all 7 characters, in the sequence shown) in your comment text. You’ll be prompted to upload your image when you submit the comment. Maximum image size is 6Mpixels. Images larger than 600px wide or 1000px tall will be reduced. Up to three images may be included in a comment. All images are subject to review. Commenting privileges may be curtailed if inappropriate images are posted.

What is one more than 7?

There are currently no comments for this tip. (Be the first to leave your comment—just use the simple form above!)


This Site

Got a version of Excel that uses the ribbon interface (Excel 2007 or later)? This site is for you! If you use an earlier version of Excel, visit our ExcelTips site focusing on the menu interface.

Newest Tips
Subscribe

FREE SERVICE: Get tips like this every week in ExcelTips, a free productivity newsletter. Enter your address and click "Subscribe."

(Your e-mail address is not shared with anyone, ever.)

View the most recent newsletter.