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:
If you have any comments or questions, feel free to e-mail me.
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.
Clickto advance the selection box. Alternatively, you can click directly on the calculator screen to set the selection box.
IMPORTANT NOTE: Time Calculator supports hours, minutes, and seconds. It doesn't yet know anything about days. Thus, hours outside the range 0-23 are acceptable. If you need to handle days, you can do a manual conversion. For example, 14:00:00 - 15:00:00 = -1:00:00. If you add 24 hours (-1:00:00 + 24:00:00), you'll get the time on the previous day (23:00:00). Remember that this is just a workaround, as Time Calculator has no idea about days. Support for days is on my list of features to add, but I don't have a whole lot of spare time these days.
Most buttons work as expected. Here are some special buttons:
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 clickor .
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.
To enter a number, type it. For other keys, refer to the table below (note that many buttons can be activated by several keys):
|+ P||- M|
|* T||/ D|
|= Enter E||. , V|
|B < Backspace||: Tab Right Arrow Space S|
|C Delete Clear||A Esc|
Users of the numeric keypad might prefer that the key . activated instead of . Here's an option you can set:
The calculator works with absolute times, so it is unaware of the time of day. You can't enter PM, just as you can't enter AM. Just enter the raw hours, minutes, and seconds.
If you're trying to find out how long you worked if you started at 8:22 AM and quit at 5:35 PM, you can convert to 24-hour time by adding 12 hours to every PM time. So, you can enter
5:35:00to get the total time you worked, 9 hours and 13 minutes. 12:00:00 8:22:00
An Android app is planned, but not ready yet. An iPhone version is unlikely since I refuse to buy Apple products and thus have no way of testing such an app.
July 24, 2012
December 30, 2011
September 12, 2011
September 11, 2011
November 12, 2010
November 3, 2010
October 28, 2010
August 12, 2010
August 8, 2010
August 1, 2010
October 28, 2008
May 4, 2008
February 28, 2008
January 9, 2006
January 8, 2006
Time Calculator 3.3.1
Copyright © 2001-2012 by Scott Severance
All rights reserved.
NOTE: The following terms apply to the Internet edition of Time Calculator (which you are currently using). Separate terms apply to the download edition.
You may freely use Time Calculator, but if you want to copy it, mirror it, distribute it, modify it, or create a derivitive work, you need my permission.
The intent of these terms is to ensure that Time Calculator is only available on one website. You may, of course, link to Time Calculator. You don't need permission to do so. Restrictions on how you may link (as some sites use) are bogus. However, I request that you don't frame my site.
Time Calculator has no warranty of any kind whatsoever (not even an implied warranty). Use it 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.
The following notice applies only to the BigDecimal.js library used by this calculator:
All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, provided that the above copyright notice(s) and this permission notice appear in all copies of the Software and that both the above copyright notice(s) and this permission notice appear in supporting documentation.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
Except as contained in this notice, the name of a copyright holder shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization of the copyright holder.
To enter numbers, just start typing. To change fields, press Space or :.