Start and end time
Use the overnight toggle when the end time lands on the next day.
Time Duration Calculator
Calculate elapsed time between a start time and end time, with overnight handling and decimal-hour output.
How this time duration calculator works
Enter a start time and an end time. The main result shows elapsed hours and minutes, while the supporting rows show decimal hours, total minutes, and total seconds.
Turn on overnight mode when the end time is on the next day. That keeps late-night spans such as 10:00 PM to 1:30 AM from looking like a negative same-day duration.
When to use duration between times
Use it for calculating elapsed time, planning schedules, checking time between appointments, classroom examples, and simple project timing. It is general time math rather than payroll or timesheet tracking.
Related time tools
For add and subtract time math, use the time calculator. For work-shift style totals, use the work hours calculator. For several clock-in and clock-out rows, use the time card calculator. For live elapsed timing, use the stopwatch. For dates between calendar days, use the date duration calculator. To calculate hours until a target date and time, use the hours until calculator. For unit conversions, use the milliseconds converter.
Time duration FAQ
How does overnight time work?
Turn on the overnight setting when the end time is on the next day. For example, 10:00 PM to 1:30 AM becomes 3 hours 30 minutes.
How is this different from the time calculator?
This page focuses on elapsed time between a start and end time. The time calculator is broader and handles add, subtract, and conversion-style time math.
Can I use this for payroll or official records?
No. It is a general elapsed-time calculator, not a payroll, legal, HR, tax, contract, or compliance system.