Duration Calculator

Calculate precise duration between two dates/times or add/subtract time periods with this free online tool.

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About This Tool

The Duration Calculator is a comprehensive tool for calculating time intervals between two specific dates and times. It supports multiple calculation modes: finding the difference between two timestamps, adding a time period to a starting point, or subtracting a time period from a starting point. Results are displayed in days, hours, minutes, and seconds with detailed breakdowns. The tool features an intuitive interface with date/time pickers, validation, and responsive design for all devices.

Save your calculation history with a free account

How to Use

Select calculation mode: Difference, Add, or Subtract.
For Difference mode: Enter start and end dates/times.
For Add/Subtract mode: Enter start date/time and duration to add/subtract.
Click 'Calculate Duration' button.
View detailed results in days, hours, minutes, and seconds.

Frequently Asked Questions

Find Quick Answers

What time formats does the calculator support?

The calculator uses standard date/time pickers for easy selection. You can choose dates from a calendar and times in 24-hour or 12-hour format depending on your system settings.

Can I calculate business days only?

No, this calculator calculates total duration including all days. For business day calculations, you would need a specialized business days calculator.

How precise are the calculations?

Calculations are precise down to the second. The tool accounts for leap years, varying month lengths, and daylight saving time where applicable.

Can I use this on mobile devices?

Yes, the tool is fully responsive and works perfectly on smartphones, tablets, and desktop computers.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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