Find the exact time between two dates and times in days, hours, minutes and seconds.
Subtract the start from the end. From 1 March 09:00 to 4 March 17:30 the duration is 3 days, 8 hours and 30 minutes — 80.5 hours in total.
The Time Duration Calculator measures the elapsed time between a start date and time and an end date and time. The result is shown as days, hours, minutes and seconds, as totals in each single unit, and as an approximate calendar span.
It is useful for shift and flight lengths, project time tracking, event schedules, uptime and downtime reports, and billing by the hour. If the two times are in different cities, convert them first with the Time Zone Calculator. To add or subtract a duration from a time use the Time Calculator.
Each date and time is turned into a number of seconds since a common starting point, and the difference is split back into units.
| Start → End | Duration |
|---|---|
| 1 Mar 09:00 → 4 Mar 17:30 | 3 days, 8 hours, 30 minutes, 0 seconds |
| 1 Mar 22:00 → 2 Mar 06:30 (overnight) | 0 days, 8 hours, 30 minutes, 0 seconds |
| 1 Jan 00:00 → 31 Dec 23:59 | 364 days, 23 hours, 59 minutes, 0 seconds |
| 10 May 08:15 → 16:45 (same day) | 0 days, 8 hours, 30 minutes, 0 seconds |
Both times are treated as being in the same time zone and no daylight-saving shift is applied, so the answer is the plain clock difference. If a daylight-saving change happened between the two moments in your location, the real elapsed time can be one hour more or less — convert to UTC first if that matters.
Subtract the start from the end. Enter both dates and times and the calculator returns days, hours, minutes and seconds.
Check the “Total hours” row. For example, 1 March 09:00 to 4 March 17:30 is 80.5 hours.
On the same date that means the end is before the start, so the two are swapped. For an overnight span, give the end the next day's date.
Yes — set the end date to the next day. For single shifts the Hours Calculator also handles overnight shifts automatically.
No. Both times are treated as the same zone with no clock change. Convert to UTC first if a daylight-saving change fell between them.
Read the totals table: total minutes and total seconds are shown with the days-and-hours breakdown.
Any span within years 1 to 9999.
This one includes the time of day and gives hours, minutes and seconds; the Date Calculator works with whole dates and gives years, months and days.
It is the whole years, months and days between the two dates (ignoring the time of day), using calendar months.
No. All calculations run in your browser.
