Time Duration Calculator
Calculate the time between two times or dates in seconds, minutes, hours, and days. Ideal for work shifts, timesheets, project timelines, and more.
If the end time is earlier than the start time, the calculator assumes the shift ends the following day.
Calculated Duration
How to Calculate Time Duration
Enter a starting time and an ending time, then select Calculate Duration. The calculator displays the elapsed time as days, hours, minutes and seconds, along with the total in each unit.
Calculator Features
- Time Only: Calculate a duration between two clock times, including overnight shifts.
- Date & Time: Calculate elapsed time across different dates, months, years and leap years.
- Now buttons: Fill the selected time and, in Date & Time mode, its corresponding date with the current local date and time.
- Exclude weekends: Exclude Saturday and Sunday hours from Date & Time calculations.
- Copy Results: Copy the calculated duration and all four totals.
Examples
Example 1: Regular Work Shift
Start: 8:30 AM. End: 5:30 PM. Duration: 9 hours.
Example 2: Overnight Shift
Start: 10:00 PM. End: 6:00 AM the following day. Duration: 8 hours.
Example 3: Weekend Exclusion
Start: Friday at 5:00 PM. End: Monday at 9:00 AM. Without exclusions, the elapsed time is 64 hours. With weekends excluded, Saturday and Sunday are skipped, leaving 7 hours on Friday (5:00 PM to midnight) plus 9 hours on Monday (midnight to 9:00 AM), for a total of 16 hours.
Frequently Asked Questions
1. How do I calculate hours between two times?
Choose Time Only, enter the start and end times, and select Calculate Duration. The calculator automatically handles an overnight interval when the end time is earlier than the start time.
2. Can I calculate time between two dates?
Yes. Open Date & Time, enter both dates and their times, and calculate the elapsed duration.
3. Does the calculator account for leap years?
Yes. Calendar dates are validated using your browser’s date calculations, including February 29 in leap years.
4. How does excluding weekends work?
In Date & Time mode, the calculator counts the elapsed seconds that fall on Monday through Friday and skips anything that falls on Saturday or Sunday. It does not automatically exclude public holidays.
5. Can I use this tool for timesheets?
Yes. It can help calculate shift durations and elapsed time. Subtract unpaid breaks separately when necessary.
6. Does it work on mobile devices?
Yes. The responsive layout adapts to mobile phones, tablets and desktop screens.
D Singha is a Civil Engineer with expertise in bridge design, structural engineering, and infrastructure projects. He shares insights on engineering, construction practices, technology, and professional development.