A time duration calculator finds how much time passes between a start date and time and an end date and time. Enter both and it shows the result in days, hours and minutes, plus the total in decimal hours, minutes and seconds — for shifts that cross midnight, multi-day jobs, travel, rentals or any deadline.
2 days, 8 hours, 30 minutes
- Total hours
- 56.5
- Hours:minutes
- 56:30
- Total minutes
- 3,390
- Total seconds
- 203,400
- In days
- 2.3542
- In weeks
- 0.3363
From Friday, November 13, 2026 at 9:00 AM to Sunday, November 15, 2026 at 5:30 PM is 2 days, 8 hours, 30 minutes (56.5 hours).
How it’s calculated
Duration = (end date − start date) × 24 hours + (end time − start time). The calculator works in minutes: whole days × 1,440 minutes plus the difference between the clock times, then converts the total back to days, hours and minutes. Decimal hours = total minutes ÷ 60.
Worked example with your numbers
- Start: Friday, November 13, 2026 at 9:00 AM. End: Sunday, November 15, 2026 at 5:30 PM.
- Total minutes: 2 days × 1,440 + 510 minutes between the clock times = 3,390 minutes.
- 3,390 minutes ÷ 1,440 = 2 whole days; the remaining 510 minutes = 8 hours 30 minutes.
- In hours: 3,390 ÷ 60 = 56.5 hours.
Clock time is used, as on a time card. On the nights clocks change for daylight saving time, the time actually elapsed is one hour less (in March) or one hour more (in November) than the clock difference.
| Span | Duration | Hours |
|---|---|---|
| Night shift, 10:00 PM to 6:00 AM | 8 hours | 8 |
| Workweek, Monday 9:00 AM to Friday 5:00 PM | 4 days, 8 hours | 104 |
| Weekend, Friday 5:00 PM to Monday 9:00 AM | 2 days, 16 hours | 64 |
| Two-week pay period, Monday 12:00 AM to Monday 12:00 AM | 14 days | 336 |
| 12-hour shift, 7:00 AM to 7:00 PM | 12 hours | 12 |
| 24-hour on-call, 8:00 AM to 8:00 AM | 1 day | 24 |
How to calculate time duration by hand
- Count the whole days between the two dates and multiply by 24 hours.
- Subtract the start time from the end time. If the end time is earlier on the clock, borrow 24 hours from the days.
- Add the two parts. Example: Monday 9:00 AM to Friday 5:00 PM is 4 days (96 hours) plus 8 hours = 104 hours.
- For payroll, turn minutes into decimal hours by dividing by 60: 7 hours 45 minutes = 7.75 hours.
Clock time and elapsed time
The calculator uses clock time, the way a time card does. Twice a year the two can differ: on the night clocks spring forward in March, a 10:00 PM to 6:00 AM shift lasts 7 real hours, and on the night they fall back in November it lasts 9. Under federal wage law the hours actually worked are what count, so adjust night shifts on those dates.
Related calculators
For the hours between two times on the same day, use the hours calculator. To add or subtract hours and minutes, use the time calculator; to count only days, use the days between dates calculator.
Frequently asked questions
How do I calculate the time between two dates and times?
Multiply the whole days between the dates by 24 hours, then add the difference between the clock times (borrowing 24 hours if the end time is earlier on the clock). The calculator does this in minutes and shows days, hours and minutes plus decimal hours.
How many hours are there from Monday 9 AM to Friday 5 PM?
104 hours: 4 days × 24 hours = 96 hours, plus 8 hours from 9:00 AM to 5:00 PM.
Does it work for overnight shifts?
Yes. Enter the next day as the end date: 10:00 PM to 6:00 AM the next morning is 8 hours.
How do I turn the result into decimal hours?
Divide the minutes by 60 and add them to the hours. 3 hours 20 minutes = 3 + 20 ÷ 60 = 3.33 hours. The calculator shows the total in decimal hours.
Does the calculator account for daylight saving time?
No — it counts clock time. On the night clocks change, the time actually elapsed is one hour less (spring) or one hour more (fall) than the clock difference.