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: Show
If you have any comments or questions, feel free to e-mail me. Scott Severance 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.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. ButtonsMost 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 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. To enter a number, type it. For other keys, refer to the table below (note that many buttons can be activated by several keys):
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 5:35:00 12:00:00 8:22:00 to get the total time you worked, 9 hours and 13 minutes.Is there an iPhone or Android app?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.
November 22, 2020
Time Calculator 3.4.1April 18, 2018
Time Calculator 3.4August 15, 2015
Time Calculator 3.3.1July 24, 2012
Time Calculator 3.3December 30, 2011
Time Calculator 3.2.1September 12, 2011
Time Calculator 3.2September 11, 2011
Time Calculator 3.1November 12, 2010
Time Calculator 3.0.4November 3, 2010
Time Calculator 3.0.3October 28, 2010
Time Calculator 3.0.2August 12, 2010
Time Calculator 3.0.1August 8, 2010
Time Calculator 3.0August 1, 2010
Time Calculator 2.4October 28, 2008
Time Calculator 2.3May 4, 2008 Time Calculator 2.2February 28, 2008
Time Calculator 2.1January 9, 2006
Time Calculator 2.0January 8, 2006
Time Calculator 1.02001
Time Calculator 3.4.2 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. Copyright NoticesThe following notice applies only to the BigDecimal.js library used by this calculator: |