Time Calculator

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
• C If the value on the screen is not 0:00:00, resets the screen without resetting the calculation. Otherwise, behaves like AC.

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:

Button	Key		Button	Key
+	p		−	m
×	t		÷	d
=	e		.	v
←	b		:	s
C	c		AC	a

• 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 ← key doesn't work in Internet Explorer if the selected field contains more than one digit.

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

• Added keyboard shortcuts

Time Calculator 2.2

February 28, 2008

• Clarified the legal language as regards distribution
• Dropped the 2 from Time Calculator, and dropped the link to Time Calculator 1

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 2.4
Copyright © 2001-2008 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 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.