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Time duration

Calculate a duration in hours and minutes, on the same day or into the next day.

Minute-resolution wall-clock times, without dates or timezones. “Next day” adds 24 hours; midnight is never inferred automatically. Equal times give 0 hours on the same day or 24 hours the next day. Daylight-saving changes are not measured. Example: 23:30 → 01:00 next day = 1 h 30 min.

Your dates and times stay in your browser and are not stored.

Method and assumptions

Method version 1.0.0 · Updated

Clock duration

Formula: End minutes − start minutes + day offset

Minute-resolution wall-clock times, without dates or timezones. “Next day” adds 24 hours; midnight is never inferred automatically. Equal times give 0 hours on the same day or 24 hours the next day. Daylight-saving changes are not measured. Example: 23:30 → 01:00 next day = 1 h 30 min.

start
Start time
end
End time
day
End day

Gregorian calendar from years 0001 to 9999. Date, duration and rounding conventions are specified for each mode.