Time Duration Calculator
Calculate the exact time between two dates and times in days, hours, minutes and seconds. Also shows total hours, total minutes and business days. Example: 15 January 8:30 AM to 17 January 5:45 PM is 2 days 9 hours 15 minutes.
Show steps
How to use the Time Duration Calculator
- Pick the start date and time.
- Pick the end date and time.
- Press Calculate to see the duration in days, hours, minutes and seconds, plus totals and weekdays.
Formula and method
Duration = end − start. The calculator converts both date-times to milliseconds, subtracts, then breaks the result into days (86,400 seconds), hours (3,600 seconds), minutes and seconds. Total hours = elapsed seconds / 3,600.
Worked example
From 15 January 2026 8:30 AM to 17 January 2026 5:45 PM: 2 days to 17 January 8:30 AM, plus 9 hours 15 minutes to 5:45 PM, gives 2 days 9 hours 15 minutes. In hours that is 2 x 24 + 9.25 = 57.25 hours, or 3,435 minutes.
Useful conversions
| Duration | Hours | Minutes |
|---|---|---|
| 1 day | 24 | 1,440 |
| 1 week | 168 | 10,080 |
| 30 days | 720 | 43,200 |
| 365 days | 8,760 | 525,600 |
| A 40-hour work week | 40 | 2,400 |
Related tools
To count days only, use the date calculator. For shifts within a single day, use the hours calculator, and to total a week of shifts use the time card calculator.
Frequently asked questions
How do I calculate the time between two dates?
Subtract the start date and time from the end date and time, then express the result in days, hours and minutes.
Does it include weekends?
The main duration does. The weekdays figure counts only Monday to Friday dates touched by the range.
What about daylight saving time?
If a clock change falls between the dates, the elapsed hours can differ by one hour from the calendar difference.
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