Doing math with times isn't as simple as doing math with regular numbers because times use a different base. Time Calculator simplifies this problem. It provides:
- An intuitive, calculator-like interface
- Support for multiple calculations
- Limited support for multiplication and division (WARNING: Read the multiplication and division section of help before using those functions—or risk incorrect results.)
- Memory functions
If you have any comments or questions, feel free to e-mail me.
Scott Severance
Time Format
The format for displaying times is hours:minutes:seconds (e.g., 2 hours, 30 minutes, and 15.4 seconds is displayed as 2:30:15.4). When entering times, the selection box (outlined in red) determines whether you are entering hours, minutes, or seconds.
Click : to advance the selection box. Alternatively, you can click directly on the calculator screen to set the selection box.
Buttons
Most buttons work as expected. Here are some special buttons:
- : Advances the selection box.
- . Inserts a decimal point. This button is disabled if the selection box is not on the seconds field.
- ← Backspace key. Deletes the last number from the selected field.
- AC Clears the the screen and resets the calculator. However, AC doesn't clear the memory.
- C If the value on the screen is not 0:00:00, resets the screen without resetting the calculation. Otherwise, behaves like AC.
- M+ and M− Add/subrtact the value displayed on the screen to the value currently in memory; or, if memory is empty, sets memory.
- MR Displays the value stored in memory on the screen, replacing whatever is currently on the screen.
- MC Clears the memory.
Unless you want to multiply or divide a time by another time (you probably don't), be sure to enter the non-time factor in the seconds field. If you don't, you will get unexpected results. As a reminder, the selection box is moved to the seconds field whenever you click × or ÷.
Here's why: Before calculating, all values are converted to seconds. That means that 0:30:00 × 0:00:2 gets converted (in part) to 0:30:00 × 2 and will output 1:00:00 as expected. However, 0:30:00 × 0:2:00 gets converted (in part) to 0:30:00 × 60 and will output 60:00:00. 0:30:00 × 2:00:00 gets converted (in part) to 0:30:00 × 7200 and will output 3600:00:00.
Keyboard Shortcuts
To enter a number, type it. For other keys, refer to the table below (note that many buttons can be activated by several keys):
| Button |
Keys |
|
Button |
Keys |
| + |
+ P |
|
− |
- M |
| × |
* T |
|
÷ |
/ D |
| = |
= Enter E |
|
. |
. , V |
| ← |
B < Backspace |
|
: |
: Tab Right Arrow Space S |
| C |
C Delete Clear |
|
AC |
A Esc |
| M+ |
Q |
|
M− |
W |
| MR |
R |
|
MC |
X |
| Help |
H ? |
|
Keybd.
Shortcuts |
K |
Users of the numeric keypad might prefer that the key . activated : instead of .. Here's an option you can set:
- Some keyboard shortcuts don't work in all browsers. All such keys have alternatives. If the one you tried doesn't work, try one of the alternatives.
- Clicking more than once on an operation button (+ − × ÷) without entering additional values will carry out that operation. Also, clicking different operation buttons without entering any numbers will carry out unintended calculations.
- The ← Button doesn't work in older versions of Internet Explorer if the selected field contains more than one digit.
Time Calculator 3.0.2
August 12, 2010
- Fixed a bug that kept Time Calculator 3 from working in older versions of Internet Explorer.
- Minor UI changes.
Time Calculator 3.0.1
August 8, 2010
- Changes made to 3.0 broke older versions of Internet Explorer. Since I don't have access to any version other than 8, I'm not able to find and fix the problem. This version presents users of older versions with several workarounds.
Time Calculator 3.0
August 1, 2010
- Time Calculator now has a memory.
- Added a calculation history panel.
- Vastly improved keyboard handling. Using the calculator via the keyboard should now be much simpler. See the keyboard help section for details.
- Added an option, located under keyboard shortcuts, to map the . key to the : button in order to simplify entering times via the numeric keypad. This option is disabled by default. Thanks to Todd Andrews for the suggestion.
- Several user interface enhancements.
- Significant code cleanup.
Time Calculator 2.4
October 28, 2008
- Replaced the algorithm to convert from seconds to hours, minutes, and seconds. The old algorithm was really inefficient, especially for large values.
Time Calculator 2.3
May 4, 2008
Time Calculator 2.2
February 28, 2008
- Clarified the legal language as regards distribution
- Dropped the 2 from Time Calculator
Time Calculator 2.1
January 9, 2006
- Minor user interface enhancements
- Added legal language to the about page
- Added version history page
Time Calculator 2.0
January 8, 2006
- Completely new interface
- Completely new back end
- Added limited support for multiplication and division
- Added support for multiple calculations
Time Calculator 1.0
2001
- Initial release
- Addition and subtraction
- Single calculations only
Time Calculator 3.0.2 Download Edition
Copyright © 2001-2010 by Scott Severance
All rights reserved.
NOTE: The terms below apply to the download edition of Time Calculator (which you're currently using). Separate terms apply to the Internet edition.
You may freely download and use Time Calculator on as many computers as you like, but if you want to modify it or create a derivitive work, you need my permission. You may not publish Time Calculator on the Internet, but you're free to provide a link to the Internet edition. If you think that you have a situation that justifies an exception, ask me.
Time Calculator has no warranty of any kind whatsoever (not even an implied warranty). Use at your own risk. If your jurisdiction does not permit such warranty exclusions, you may not use Time Calculator.
If you have any questions or suggestions, drop me a line. Many of the features of Time Calculator are the direct result of user feedback.