How do I calculate duration between two times?

Enter the start time and end time. If the end is after midnight, turn on the next-day option.

Can I subtract a lunch break?

Yes. Enable break deduction and enter the break length in minutes.

Can I calculate duration across several dates?

Yes. Use the date-time mode for intervals that include full dates and times.

Does it calculate overtime or payroll rules?

No. It calculates elapsed time only. Overtime, rounding and payroll rules must be checked separately.

Duration Calculator

Calculate duration between a start and end time or between two date-times, with optional break deduction, overnight shifts, decimal hours and night-minute reference.

Start

End

End is next day (overnight shift)

Subtract break (min):

Duration

8 hours 30 minutes

08:30:00 / 8.500 decimal hours

0006121824

Total hours:

Total minutes:

510

Total seconds:

30,600

8-hour shifts:

1.06

Decimal hours:

8.500

Night minutes (10 PM-6 AM):

Roughly comparable to:

8-hour workday× 1.1

45-minute class× 11

45-minute episode× 11

90-minute match× 5.7

120-minute workshop× 4.3

90-minute sleep cycle× 5.7

60-minute hour× 8.5

Duration between start and end time

Duration calculator intent usually starts with two boundaries: a start time and an end time, or two full date-times for longer intervals.

T_{d u r a t i o n} = T_{e n d} - T_{s t a r t} - T_{b r e ak}

Break deduction is optional. In time-only mode, enable next day when the end time belongs to the following calendar day.

Shifts, breaks and overnight intervals

Time-to-time mode fits a single work shift, meeting, class or activity.
Date-time mode fits intervals that span dates or need exact calendar boundaries.
Break minutes can be deducted from the elapsed duration.
Night minutes from 10 PM to 6 AM are shown as a reference and may need manual adjustment after a break.

Not a payroll or legal calculator

The calculator does not apply overtime, labor-law rules, employer rounding policies, holidays or paid-break rules.

Frequently Asked Questions

Sources and References

Calculations are based on the listed reference sources. Links open in a new tab.

Updated: June 2, 2026

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Time Calculator

Add and subtract time durations in HH:MM:SS, HH:MM or unit format, with decimal hours, total minutes, total seconds and copyable results.

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Add Time to Date Calculator

Add years, months, weeks, days, hours, minutes and seconds to a start date and time, then see the resulting date-time and total offset.

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Subtract Time from Date Calculator

Subtract years, months, weeks, days, hours, minutes and seconds from a start date and time, then see the resulting past date-time.

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