Time Difference Calculator

Written byOleh Soloninupdated 25 September 2026

Start At

End At

Result

Duration15d 9h 30m
Total hours369.5
Total minutes22,170

From one timestamp to another

Measure the exact span between two moments, down to minutes. For shifts, downtime reports and elapsed-time questions.

When a span crosses midnight, arithmetic stops being obvious. A shift from 22:00 to 06:00 is eight hours, but subtracting the numbers gives you minus sixteen.

Giving both a date and a time removes the ambiguity, so overnight shifts and multi-day incidents come out right.

How to use

Enter the start date and time.
Enter the end date and time — for a night shift that is the following day.
Read off the span in days, hours and minutes, and the same span as total hours and total minutes.

Example spans

Each row is a separate run, counted without clock changes. In a zone that moves its clocks, a span across the change is an hour shorter or longer: New York moved forward on 8 March 2026, so the second row there would be 368.5 hours.

Every row comes from the calculator on this page.
Start	End	Duration	Hours	Minutes
2026-03-01 22:00	2026-03-02 06:00	8h 0m	8	480
2026-03-01 09:00	2026-03-16 18:30	15d 9h 30m	369.5	22,170
2026-12-31 23:30	2027-01-01 00:15	0h 45m	0.75	45
2026-09-21 09:00	2026-09-25 18:00	4d 9h 0m	105	6,300
2026-09-01 00:00	2026-10-01 00:00	30d 0h 0m	720	43,200
2026-03-02 06:00	2026-03-01 22:00	−8h 0m	−8	−480

What this calculator shows

The exact span in days, hours and minutes
Correct handling of spans that cross midnight
The same duration expressed in total hours and total minutes

What to keep in mind

Both moments are treated as being in the same timezone.
Daylight saving transitions can make a calendar day 23 or 25 hours long.

FAQs

How do I calculate hours across midnight?

Give both the date and the time for each end. The tool then measures a real interval rather than subtracting two clock faces.

Does daylight saving affect the result?

It can. A day containing a clock change is 23 or 25 hours long, which is exactly why payroll for that night needs checking.

Can I get the answer in minutes?

Yes, the total is shown in minutes and in hours as well as the days-hours-minutes breakdown — useful for billing.

What if I put the later date first?

The result comes out negative and the calculator points out that the end is before the start: 06:00 on 2 March to 22:00 on 1 March gives −8h 0m.

How many hours are there from 09:00 on 1 March to 18:30 on 16 March?

369.5 hours — 15 days, 9 hours and 30 minutes, or 22,170 minutes.

How many hours are in a month?

It depends on the number of days: September 2026, from 00:00 on 1 September to 00:00 on 1 October, is 720 hours; a 31-day month is 744.

Worked example

A night shift

Input: 22:00 on 1 March to 06:00 on 2 March

Output: 8 hours

Note: Naive subtraction of clock times gives −16 hours. Including the date is what makes the answer sensible.

Useful links

All tools in Date & Time World Clock Time Difference

Time Difference Calculator

Result

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