Time Duration Calculator Online — Free Tool
Calculate time between two dates, add days and hours to a date, and see duration in days, weeks, business days, and HH:MM:SS.
Find the exact elapsed time between two moments — in years, months, days, hours, minutes, and seconds.
Times use your device timezone. For GMT/UTC conversion between cities, use the time zone converter.
About this tool
The Time Duration Calculator finds the exact time between any two dates and times — displayed simultaneously in years, months, days, hours, minutes, seconds, total weeks, total business days, and HH:MM:SS format. It also works in reverse: add or subtract a duration from a date to find a future or past date.
All calculations use your device's local timezone and run entirely in your browser. For converting between timezones across cities, use the Time Zone Converter.
Common use cases
- Calculating how many days until a deadline or event
- Finding business days between two dates for project planning
- Calculating someone's exact age in years, months, and days
- Working out elapsed time between two logged events
- Adding a number of days to today to find a future date
- Legal and contract date calculations such as notice periods
How to use
- Select 'Time between two dates' to find the gap, or 'Add time to a date' to calculate a future or past date.
- Set your start and end dates and times using the date pickers.
- Results appear instantly in all formats: calendar breakdown, total days, business days, HH:MM:SS, and more.
- Click 'Copy result' to copy the full output to your clipboard.
Note: Calculations use your device's local timezone. For timezone conversions between cities, use the Time Zone Converter.
This page is available at /tools/time-duration-calculator/.
Related keywords
- time duration calculator
- elapsed time calculator
- time between two dates
- calculate elapsed time
- time elapsed calculator
- date difference calculator
- calculate time elapsed
- how much time has elapsed
- business days between dates
Related tools
FAQ
How do I calculate business days between two dates?
Enter your start and end dates — the Business days result automatically excludes Saturdays and Sundays. Public holidays are not excluded as these vary by country.
How do I calculate elapsed time in hours and minutes?
Enter your start and end datetime — the tool shows the result in HH:MM:SS format as well as total hours and total minutes.
Can I calculate how many days until a future date?
Yes — set the start date to today using the 'Start = now' button and set the end date to your target date.
Does the calculator account for leap years?
Yes — it uses exact calendar calculations so February 29 in leap years is counted correctly.
Why does my result show 0 business days for a weekend period?
A period falling entirely on Saturday and Sunday has zero business days — this is correct behavior.