Time Duration Calculator
Enter a start and end date and time to get the exact duration between them.
About this tool
How long is it between 8:15 this morning and 4:40 this afternoon? Or between a project start date and its deadline? The Time Duration Calculator finds the exact time between two dates and times, showing the result in days, hours, minutes and seconds so there is no mental arithmetic. It handles overnight spans, multi-day gaps and different dates in a single step, which makes it handy for shift lengths, travel time, event planning, study logs and countdown estimates. Enter a start and an end, press calculate and copy the answer. Everything runs in your browser with nothing to install, and no personal information is needed. If you are totalling a full week of hours for payroll, move on to the Time Card Calculator, and when you need to measure a task live, the Online Stopwatch records it in real time. For events that end on a fixed date, a live view like the Christmas Countdown shows the remaining time continuously. Planning a sleep schedule? The Sleep Cycle Calculator uses time spans to suggest bed and wake times. Explore related tools in the Calculators category, including an age calculator and a business days counter.
How do I calculate the time between two times?
How do I calculate the time between two times? Subtract the start time from the end time. If the end is earlier in the day, add 24 hours (the span crosses midnight). For example, 10:45 PM to 6:15 AM is 7 hours 30 minutes. This calculator does it for any two dates and times.
How to use the time duration calculator
- Enter the start date and time.
- Enter the end date and time.
- Read the duration and totals in hours, minutes and seconds.
Features
- Days, hours, minutes and seconds
- Totals in each unit
- Uses your local time zone, so a daylight saving change is counted correctly
Good for
- Travel and flight times
- Billing time on a project
- How long an event lasted
Frequently asked questions
Does daylight saving affect the result?
Yes, correctly. If a span includes the night clocks go forward, it is one hour shorter in real time, and the result reflects that.
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