📅 Date & Time

Time Duration Calculator

Calculate the duration between two clock times, including overnight shifts.

minutes

Results

Duration
8:00 (h:mm)
Decimal hours
8.00
Total minutes
480

📊 Time Duration Calculator chart

Proportional breakdown of the result.

What is the Time Duration Calculator?

Calculate the duration between two clock times, including overnight shifts. Dates are deceptively tricky — months have different lengths and leap years shift everything. These date and time calculators handle calendar math exactly, using UTC to avoid daylight-saving surprises.

Time Duration Calculator – free online date & time tool illustration
Time Duration Calculator — free, exact and private.

How to use the Time Duration Calculator

  1. Enter your start time, your end time, your unpaid break.
  2. Results update automatically as you type; you can also press Calculate.
  3. Read the output: duration, decimal hours, total minutes.
  4. Use the 📊 chart to see the result visually, then copy or share it.

Formula and method

Duration = End − Start (+24 h if overnight) − break

Worked example

With start time = 09:15, end time = 17:45, unpaid break = 30 minutes, the Time Duration Calculator returns duration: 8:00 (h:mm); decimal hours: 8.00; total minutes: 480.

Tips for better results

  • Decide whether you need to include the end date when counting days.
  • Business-day counts exclude weekends but not public holidays unless you subtract them.
  • Timestamps are shown in UTC; convert to your local time zone as needed.

Frequently asked questions

What does the Time Duration Calculator do?

Calculate the duration between two clock times, including overnight shifts.

How is it calculated?

The Time Duration Calculator uses this method: Duration = End − Start (+24 h if overnight) − break.

Can you show an example?

With start time = 09:15, end time = 17:45, unpaid break = 30 minutes, the Time Duration Calculator returns duration: 8:00 (h:mm); decimal hours: 8.00; total minutes: 480.

Is the Time Duration Calculator accurate?

Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.

Is this tool free and private?

Yes — the Time Duration Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.

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