time:calcVersion 3

Redesigned for iPad and iPhone Enjoy!

After many design, feedback and user trial session, the new version of time:calc is released. Thank you to everyone who has been involved for your comments, suggestions and trials. Four calculators are now provided and accessed by a new grid view - making working with multiple calculations and conversions much easier, and working with days has had a face-lift too. I really hope you enjoy this new version - complete with iPad support thrown in!

As always, if you have any comments or suggestions please drop me a line and I'll get back to you as soon as I can.


You can choose a different colour for each calculator to help quick identification.

Mode Keys

Each calculator has four mode keys that you can configure from settings. Each calculator can have it's own unique configuration to suit your needs.

Round the Clock

Round the Clock is designed for working in time of day. Find out more in Working with time.


Give each of your configurations it's own name.


Specifically designed for working in film and video with industry standard and custom time codes - even single frames.

Auto Colon

With auto colon turned on, time:calc will automatically format your input for the mode you are in. With auto colon turned off, you can be more flexible with your input and time:calc will then convert your input later - for example you could enter 1:62 and time:calc will convert it into 2:02 for you as properly formatted time.

Working with time Conversions and calculations.

Time is the basic unit of operation for time:calc. It handles your input as time, and displays the results formatted in time. You can work in any format that suits you - and then convert between formats by switching modes. And every mode can be used for calculations.

In h:m:s mode (hours:minutes:seconds) enter:
19:00:00 ⊗ 5 ⊜
and the answer is

Tap h (hours) mode and the answer is converted into 1.5833 hours

Tap m (minutes) mode and the answer is converted into 95 minutes.

Tap s (seconds) mode and the answer is converted into 5700 seconds

Working with days Multiple days, or just a single day.

There are two ways to work with days. Either you can work with multiple days as quantities, or you can work with all days superimposed on a single clock.

Working with multiple days represents every 24 hours as another day. So 25 hours in d:h:m:s mode is represented as 1:01:00:00.

Working with a single day allows you to make calculations in time-of-day that cross midnight - this is only available in h:m:s and h:m modes. If you start work at 9am and finish at 11am, in h:m mode you can do the calculation:
11:00 ⊝ 9:00
This will tell you that you have worked 2 hours. However, if you worked a night shift and worked from 23:00 until 03:00 - then, with round-the-clock turned on,
03:00 ⊝ 23:00 ⊜ 4:00
The round-the-clock icon will show -1 letting you know you have gone backwards over midnight once whilst working four hours.