Time duration calculator
How long between two times or two dates, given in days, hours, minutes and seconds at once. Handles overnight and multi-day spans. Free, no signup, and nothing leaves your browser.
That is 0.05 weeks, or 30,600 seconds.
How do you calculate the duration between two times?
Convert both times to minutes past midnight, subtract, and convert back. 09:00 is 540 minutes and 17:30 is 1,050, so the difference is 510 minutes, or 8 hours 30 minutes. When the end time is on a later date, add 1,440 minutes for each day in between.
How do I calculate hours across midnight?
Add 24 hours to the end time before subtracting. A shift from 22:00 to 06:00 becomes 22:00 to 30:00, which is 8 hours. This calculator handles it automatically when you set the end date to the following day.
What is the difference between duration and elapsed time?
Nothing, in ordinary use. Both mean the amount of time between two points. The distinction only matters in physics and in stopwatch software, where elapsed time can mean time since a fixed start that is still running.
Common durations
| Span | Hours | Minutes |
|---|---|---|
| 9:00 to 17:00 | 8 | 480 |
| 9:00 to 17:30 less 30 min lunch | 8 | 480 |
| 22:00 to 06:00 (overnight) | 8 | 480 |
| One full day | 24 | 1,440 |
| One week | 168 | 10,080 |
Duration is not the same as attention
Eight hours between two clock readings is eight hours of elapsed time and some smaller, unknown quantity of actual work. The first number is arithmetic and this page will give it to you. The second one cannot be calculated from the endpoints at all, which is the reason a duration between two times has never answered the question people are really asking when they look one up.
Or stop filling these in
A calculator can only add up what you remembered to write down, and what you write down a week later is smoother and more purposeful than the week was. Cronus records which app and window you were in and works out what the time was in service of, automatically. No timer to start, so the chaotic days produce a record instead of a gap.
$6 a month after a 21-day free trial. It never captures your screen.
Related: hours calculator, military time converter, and work hours calculator.