Please Note: This article is written for users of the following Microsoft Excel versions: 2007, 2010, 2013, 2016, 2019, and Excel in Office 365. 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: Displaying Negative Times.

Displaying Negative Times

by Allen Wyatt
(last updated August 28, 2021)

1

Mike has a worksheet that contains some times. If he subtracts 6:33 from 6:21 he noticed that he doesn't get a negative elapsed time, as in -:12. Instead he gets ############# in the cell. Mike is wondering how he can display the negative time difference properly?

The easiest way to solve this problem is to just change the date system used by the workbook. This may sound goofy, but if you use a 1900 date system (which is the default for Windows versions of Excel), then you get the ############# in the cell. If, instead, you change to the 1904 date system (which is the default for Mac versions of Excel) then you'll see the correct negative elapsed time in your formula.

To change the date system, follow these steps:

  1. Display the Excel Options dialog box. (In Excel 2007 click the Office button and then click Excel Options. In Excel 2010 or a later version, display the File tab of the ribbon and then click Options.)
  2. Click Advanced at the left side of the dialog box.
  3. Scroll through the options until you see the section called When Calculating This Workbook. (See Figure 1.)
  4. Figure 1. The Advanced options of the Excel Options dialog box.

  5. The Use 1904 Date System check box controls which dating system is used, just as in earlier versions of Excel.

If you prefer to not change the dating system used in the workbook (perhaps it may mess up some other date formulas you have in the worksheet), then the only thing you can do is to create a text-based version of the time differential using a formula such as the following:

=IF(B2-A2<0, "-" & TEXT(ABS(B2-A2),"hh:mm"), B2-A2)

If the difference between the two time values (in A2 and B2) is negative, then the formula concatenates a text value consisting of the minus sign and the absolute value of the difference between the times.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (6239) applies to Microsoft Excel 2007, 2010, 2013, 2016, 2019, and Excel in Office 365. You can find a version of this tip for the older menu interface of Excel here: Displaying Negative Times.

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. ...

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What is five minus 3?

2021-09-16 14:52:30

Dan Simhony

Dear Mr Wyatt, not only 1904 date system messed up existing registered dates, it also prevented me for assigning date values to worksheet cells. Took me an entire frustrating evening to find out why my old test procedures stopped working. Luckily I tried it on a single test workbook. Users should do well to stick with the beaten path.


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