Time Duration Calculator

Calculate exact elapsed time between two clock times, or add and subtract hours and minutes with automatic midnight handling.

Duration composition & clock arithmetic.

What do you want to do?

Start timeEnd time

Duration

8h 0m

Times crossing midnight are flagged — the result may land on the next or previous day.

Worked Example — an overnight shift, 10 PM to 6 AM

8h 0mCrosses midnight into the next day — treated automatically, not as an error

This works on clock times only — not a full date and time span. If you need the duration between two different calendar dates (not just two times of day), use the Date Difference Calculator instead. This tool is for questions like "from 9am to 5pm" or an overnight shift, not "from March 5 to March 8."
It doesn't automatically deduct a lunch or unpaid break. The duration shown is the raw time between your start and end (or after adding/subtracting), with no break subtracted. Subtract your break time from the result manually if you need net worked hours.

Last reviewed July 2026