Add or Subtract hours minutes seconds

About the tool

This calculator will let you add hours, minutes, seconds multiple times.

You can also add then subtract hours, minutes, seconds.

Could be useful to get total sum of workout routine minutes or a playlist with songs that you want to know total sum of hours, minutes and seconds added up.

This website will work offline on your device after the first visit. (Unless you will clear browser cache or visit this website on a new device)

Shortcut Keys

You can use + or - keys on your keyboard to add or subtract and Enter key to Show Result.

With arrow keys left and right you can navigate from one input to the other. Up and Down keys to move from one row to the other.

Limitations

This tool is not designed to calculate how long it will take time if you work graveyard shift. Lets say you work from 10 pm to 7 am.

You'd have to:

• Convert your starting hour into 24 hour format
• Subtract from 24 hours your starting hour
• Lastly, add ending time

So it'd go like this:

• 10 pm = 22 hours
• 24 - 22 = 2 hours
• 24 - 22 + 7 = 9 hours

Or in a case of 9 am - 5 pm, it would be a bit simpler. Convert 5 into 24 hour format and subtract 9. 17 - 9 = 8 hours

This tool will not work in browsers that do not support javascript or the javascript is turned off.

Feedback

You can leave any feedback by writing to addsubtracttime@gmail.com

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