Online Time Duration and Add/Subtract Time Calculator
This free time calculator helps you find the duration between two times, subtract break time, handle overnight periods, and calculate future or past dates by adding or subtracting years, months, weeks, days, hours, and minutes.
Useful Time Calculation Examples
- Work Hours: Calculate 9:00 AM to 5:30 PM and subtract lunch or break time.
- Overnight Shifts: Calculate 10:00 PM to 6:00 AM by enabling the next-day option.
- Meeting Duration: Find the exact duration of calls, classes, events, or appointments.
- Deadline Planning: Add 2 days and 4 hours to a start date to calculate the finish time.
- Past Date Calculation: Subtract a duration from a known date to find when a task started.
Duration Calculator vs Date Calculator
Use the duration section when you only care about elapsed time between a start and end clock time. Use the add/subtract section when you need a calendar result such as the exact date 45 days from today or the time 36 hours before a deadline.
How Break Deduction Works
Enter start time, end time, and optional break hours or minutes. The calculator subtracts the break from the total elapsed time and shows the final answer in readable format, decimal hours, total minutes, and total seconds.
Calculate clock-time duration, work hours, overnight shifts, and future or past dates from one page.
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