Taking the Time into Account in a Formula

by Allen Wyatt
(last updated June 8, 2019)

Ken would like to display the contents of a cell based on the time of day. For instance, if cell C1 contains the NOW function (for the time of day), in another cell he would like a formula that checks that time. If it is before 5:00 pm, then the formula displays the contents of cell E1. If the time is after 5:00 pm, then the formula displays the contents of cell F1. Ken is not sure how to work out the IF statement so that it checks the time properly.

The key to accomplishing this task is remembering how Excel stores times and dates internally. When you use the NOW function, it returns a serial number that represents the current date and time. Everything in that serial number to the left of the decimal point is the date, and everything to the right is the time. Get rid of the date portion before doing your comparison, and you are then comparing apples to apples (so to speak).

One way to get rid of the date portion of the serial number is in this manner:

=IF(C1-INT(C1)<TIME(17,0,0),E1,F1)

The TIME function returns only the time portion of a date/time serial number for whatever hours, minutes, and seconds you specify in the parameters. Since you want 5:00 pm, then only the hours portion needs to be set to 17.

Another way to strip out the date portion of the serial number is to use the MOD function, in this manner:

=IF(MOD(C1,1)<TIME(17,0,0),E1,F1)

The function returns the remainder after dividing the value in C1 by 1. The remainder, in this case, is everything to the right of the decimal point—the time.

Perhaps the easiest way to do the comparison, however, is to skip any math on the value in C1 altogether. Instead, utilize the HOUR function, in this manner:

=IF(HOUR(C1)<17,E1,F1)

The HOUR function examines the date/time serial number in cell C1 and returns a value of 0 through 23, depending on the hour of the day represented by that serial number. Compare this to 17 (the value of the 5:00 pm hour) and your formula can display the desired value based on the time of day.

It is important to remember that the NOW function (on which your formula hinges) is updated only when the worksheet is updated. This means that if your worksheet is updated at 4:55 pm and then not updated again until 5:10 pm, then during that 15 minutes the formula will return the "before 5:00 pm" value because it doesn't yet know it is after 5:00 pm until the recalculation.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (12889) applies to Microsoft Excel 2007, 2010, 2013, 2016, 2019, and Excel in Office 365.

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

Altering the Displayed Format of Numbers to the Nearest 100

Want information in a worksheet to be formatted and displayed as rounded to a power of ten? You may be out of luck, ...

Discover More

Reversing All the Paragraphs in a Document

Documents consist of a series of paragraphs, arranged in the order in which you need them. What if you need to reverse ...

Discover More

Typing a Schwa Character in Excel

How you add special characters to Excel can differ from how you add them in other Office programs, such as Word. This tip ...

Discover More

Professional Development Guidance! Four world-class developers offer start-to-finish guidance for building powerful, robust, and secure applications with Excel. The authors show how to consistently make the right design decisions and make the most of Excel's powerful features. Check out Professional Excel Development today!

More ExcelTips (ribbon)

Checking for Time Input

Need to know if a cell contains a time value? Excel doesn't contain an intrinsic worksheet function to answer the ...

Discover More

Displaying a Result as Minutes and Seconds

When you use a formula to come up with a result that you want displayed as a time, it can be tricky figuring out how to ...

Discover More

Counting Times within a Range

Excel allows you to easily store dates and times in your worksheets. If you have a range of cells that contain times and ...

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}] 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 minus 0?

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.