Time duration calculator
Find elapsed days, hours, minutes and seconds between two UTC date-times.
Formula
Total hours = elapsed seconds ÷ 3,600
Start (UTC) = 2026-10-12T09:15 · End (UTC) = 2026-10-13T11:45
How to use
- Enter the start date and time in UTC.
- Enter the end date and time in UTC.
- Read total hours and the day/hour/minute breakdown.
Examples
- 09:15 on October 12 to 11:45 on October 13 is 26.5 hours.
Frequently asked questions
Can the interval cross midnight?
Yes. Use the correct date for each endpoint.
What is a day in this result?
Exactly 24 hours, without leap-second adjustments.
Can I enter an earlier end?
No. For a duration, the end must be at or after the start.
Sources
Updated: