Date Duration Calculator
Calendar dates are compared in UTC to avoid daylight-saving changes. Inclusive mode adds one day.
Inputs and units
- Start date: Enter your value in the format and unit shown.
- End date: Enter your value in the format and unit shown.
- Count end date: Choose No, Yes.
Calculation method
Calendar dates are compared in UTC to avoid daylight-saving changes. Inclusive mode adds one day.
Worked example
The example values are: Start date = 2026-01-01; End date = 2026-02-01; Count end date = no
- Days: 31
- Weeks and days: 4 weeks, 3 days
- Hours: 744
Assumptions and limitations
Check that the inputs and units describe your situation.
Using your result
Select Calculate after changing inputs. Copy result copies the displayed output; Download result saves a text file. Reset returns the form to its example inputs. Calculations run in your browser.
Date Duration Calculator FAQs
What method does this calculator use?
Calendar dates are compared in UTC to avoid daylight-saving changes. Inclusive mode adds one day.
What should I check before using the result?
Check that the inputs and units describe your situation.