Loading
Excel.Tips.Net ExcelTips (Menu Interface)

Dealing with Small Time Values

Please Note: This article is written for users of the following Microsoft Excel versions: 97, 2000, 2002, and 2003. If you are using a later version (Excel 2007 or later), this tip may not work for you. For a version of this tip written specifically for later versions of Excel, click here: Dealing with Small Time Values.

Zuzana has a need to perform calculations with very small time increments, such as thousandths of a second. She wonders how small of times Excel can deal with and how she can format for the display of the small increments.

Because of the way in which Excel stores times internally, it can theoretically deal with a time increment much smaller than a thousandth of a second. I say theoretically because there are a lot of factors that can negatively impact that precision.

As an example, consider that times and dates are stored in Excel such that full days are stored to the left of the decimal point and fractions of days are stored to the right. If you wanted to store a value as small as a hundred billionth of a second, you could conceivably do it. To store such a number in this format you end up with 1 day divided by 24 hours divided by 60 minutes divided by 60 seconds divided by 100,000,000,000. This results in a number that looks like this:

0.000000000000000115740740740741

Notice that there are a bunch of zeros followed by 15 significant digits. This is because Excel can only store a number that includes up to 15 significant digits. If you start doing anything else with this value, you ruin the value. For instance, you could add 3 to the value, signifying the addition of three days. Excel would then render this as the result:

3.000000000000000000000000000000

Notice that the small time increment disappeared. This happened because in the result of the addition, everything after the 3 became "significant," and Excel can only keep track of up to 15 significant digits, which was all zeros in the original number.

A thousandth of a second is a much longer duration than a hundred billionth of a second; it is represented in Excel's internal formatting as this:

0.0000000115740740740741

If you add three days to this value, you end up with this:

3.00000001157407

This is still accurate enough to render thousandths of a second just fine.

Of course, it doesn't do much good to store thousandths of a second internally if you can't display them in Excel. This is where custom formatting comes into play. You can create a custom format (as described in other issues of ExcelTips) that will display thousandths of a second just fine. Here's the format to use:

h:mm:s.000

If you try to use more zeros in the format (to display smaller increments of time), Excel will balk. The smallest increment you can display using custom formats is a thousandth of a second.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (9198) applies to Microsoft Excel 97, 2000, 2002, and 2003. You can find a version of this tip for the ribbon interface of Excel (Excel 2007 and later) here: Dealing with Small Time Values.

Related Tips:

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!

 

Leave your own comment:

*Name:
Email:
  Notify me about new comments ONLY FOR THIS TIP
Notify me about new comments ANYWHERE ON THIS SITE
Hide my email address
*Text:
*What is 5+3 (To prevent automated submissions and spam.)
 
 
           Commenting Terms

Comments for this tip:

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

Our Company

Sharon Parq Associates, Inc.

About Tips.Net

Contact Us

 

Advertise with Us

Our Privacy Policy

Our Sites

Tips.Net

Beauty and Style

Cars

Cleaning

Cooking

DriveTips (Google Drive)

ExcelTips (Excel 97–2003)

ExcelTips (Excel 2007–2016)

Gardening

Health

Home Improvement

Money and Finances

Organizing

Pests and Bugs

Pets and Animals

WindowsTips (Microsoft Windows)

WordTips (Word 97–2003)

WordTips (Word 2007–2016)

Our Products

Helpful E-books

Newsletter Archives

 

Excel Products

Word Products

Our Authors

Author Index

Write for Tips.Net

Copyright © 2016 Sharon Parq Associates, Inc.