Hours Between Calculator

Select a start date and time, select an end date and time, and get the exact elapsed duration in hours, minutes, and days. Choose 24-hour time or AM/PM input.

Examples

Same-day interval

From 09:00 to 17:30 on the same date.

Time format: 24-hour
Start date and time: May 27, 2026, 9:00 AM
End date and time: May 27, 2026, 5:30 PM

Duration

0d 8h 30m

Decimal hours

8.5 h

Total minutes

510 min

Total days

0.3542 days

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How It Works

Formula

\text{startMinutes} = \text{dateIndex}_{start} \times 1440 + \text{hour}_{start} \times 60 + \text{minute}_{start}

\text{endMinutes} = \text{dateIndex}_{end} \times 1440 + \text{hour}_{end} \times 60 + \text{minute}_{end}

\text{durationHours} = (\text{endMinutes} - \text{startMinutes}) / 60

Variables, symbols and units

$\text{dateIndex}$: Whole calendar-day index for the selected date
$\text{startMinutes}$: Start date-time converted to total minutes
$\text{endMinutes}$: End date-time converted to total minutes
$\text{durationHours}$: Elapsed minutes divided by 60
$1440$: Minutes in one day

Calculation method explained

Choose the start and end date-times. The calculator converts each local date-time into a minute index, subtracts the start from the end, and shows the difference as days-hours-minutes, decimal hours, total minutes, and total days.

Each selected date is converted to a whole-day index, then the selected hour and minute are added. Subtracting the start minute index from the end minute index gives the elapsed minutes. Negative intervals are rejected so the result is never ambiguous.

Examples

Same-day interval24-hour · May 27, 2026, 9:00 AM → 0d 8h 30m

From 09:00 to 17:30 on the same date.

Time format: 24-hour
Start date and time: May 27, 2026, 9:00 AM
End date and time: May 27, 2026, 5:30 PM

Duration: 0d 8h 30m

Overnight interval24-hour · May 27, 2026, 10:00 PM → 0d 8h 0m

From late evening to early morning on the next date.

Time format: 24-hour
Start date and time: May 27, 2026, 10:00 PM
End date and time: May 28, 2026, 6:00 AM

Duration: 0d 8h 0m

Multi-day intervalAM/PM · May 27, 2026, 2:15 PM → 2d 19h 30m

A longer span where days and hours both matter.

Time format: AM/PM
Start date and time: May 27, 2026, 2:15 PM
End date and time: May 30, 2026, 9:45 AM

Duration: 2d 19h 30m

Frequently Asked Questions

Does it handle intervals across midnight?

Yes. Because both inputs include a date, midnight crossings are handled by the selected dates instead of a separate overnight toggle.

Can I use AM/PM instead of 24-hour time?

Yes. Change the Time format control to AM/PM and the hour dropdowns switch to 1-12 with an AM/PM selector. The stored value remains unambiguous.

Does this include time zones or daylight saving changes?

No. The calculator treats the selected date and time as local civil values and measures the calendar-clock difference between them.

Why was the break field removed?

This calculator now measures pure elapsed time between two date-times. Breaks, payroll rules, and shift policy belong in a separate work-hours calculator.

Hours Between Calculator

Same-day interval

How It Works

Examples

Frequently Asked Questions

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