Example 1
- Start: 2026-08-30, 08:00
- End: 2026-08-30, 16:30
8 hours 30 minutes
How long is 8:00 to 16:30 on the same day? 8 hours 30 minutes, or 8.5 h.
Time Duration Calculator
The calculator counts the span between two dates with times. 8:00 to 16:30 on the same day is 8 hours 30 minutes. 22:00 to 6:00 the next day is 8 hours.
Clock times without a date are on the hours calculator. Civil days only: difference between dates.
Result
Enter a start date and time and an end date and time. The span will appear here.
How it works
The calculator turns each date-and-time pair into clock minutes and subtracts the start from the end. 8:00 to 16:30 on the same day is 510 minutes, which is 8 hours 30 minutes.
When the dates differ, full days of 1,440 minutes are added. 22:00 on August 29 to 06:00 on August 30 is 8 hours. January 1 at 00:00 to January 3 at 12:00 is 2 days 12 hours.
An empty time is 00:00. The same dates and the same times give 0 minutes, not a full day.
When the end is earlier than the start, the calculator asks you to reverse the fields. It does not add a day automatically, because the date is already in the form.
The minutes are clock minutes, without a time zone and without daylight saving. A clock change at night does not shorten or lengthen the result.
This is not a timesheet and not overtime. Clock times without a date belong on the hours calculator. Civil days belong on the date difference page.
Formula
minutes = (end − start) in clock minutes; days = floor(minutes / 1,440)
Decimal hours = minutes / 60. An empty time is 00:00. The calculator does not accept a negative span.
How to use
- Enter the start date and time, for example August 30, 2026, 08:00.
- Enter the end date and time, for example the same day, 16:30. The result is 8 hours 30 minutes.
- For an overnight span enter August 29 at 22:00 and August 30 at 06:00. The result is 8 hours.
- If you leave the time empty, the calculator uses 00:00. If the end is earlier than the start, reverse the fields.
8 h 30 min from 8:00 to 16:30
The calculator subtracts start minutes from end minutes. 8:00 to 16:30 on that day is 510 minutes.
- minutes
- The clock span. 8:00 to 16:30 is 510. 22:00 to 6:00 the next day is 480.
- 8,5 h
- Decimal hours: 510 / 60. That is a spreadsheet form, not a different span.
- 1440
- Minutes in a full day. They are added when the dates differ.
Examples
Example 2
- Start: 2026-08-29, 22:00
- End: 2026-08-30, 06:00
8 hours
How long is 22:00 to 6:00 the next day? 8 hours, or 480 minutes.
Example 3
- Start: 2026-01-01, 00:00
- End: 2026-01-03, 12:00
2 days 12 hours
How long is January 1 at 00:00 to January 3 at 12:00? 2 days 12 hours, or 60 h.
Related calculators
Frequently asked questions
How long is 8:00 to 16:30 on the same day?
8 hours 30 minutes, which is 8.5 hours and 510 minutes.
How long is 22:00 to 6:00 the next day?
8 hours. The dates differ, so the result crosses midnight and is 480 minutes.
How long is January 1 at 00:00 to January 3 at 12:00?
2 days 12 hours, which is 60 hours and 3,600 minutes.
What if the times are left empty?
The calculator uses 00:00. Two dates without times give full days from midnight to midnight.
What if the end is earlier than the start?
The result is not negative. Reverse the dates or the times.
Is this a timesheet or overtime?
No. This page shows the clock span. Pay belongs on the overtime page.
Does daylight saving shorten the night from 2:00 to 3:00?
No. The minutes are clock minutes, without a time zone. 22:00 to 6:00 the next day is always 8 hours.
How is this different from the hours calculator?
The hours calculator does not ask for a date. Here the date is in the form, so a night or several days count directly.
How is this different from the date difference page?
Date difference counts civil days, for example 366 in a leap year. Here the result is in hours and minutes.
Does a comma work in the time field?
Time comes from the clock field in HH:MM. Dates come from the date picker.
Sources
The span is the clock-minute difference between two moments.
Page updated in 2026.