What is this calculator?
Count signed calendar days and weeks between a start date and an end date.
What can you use it for?
Use it for practical planning, conversions, measurement or checking the result described here. Count signed calendar days and weeks between a start date and an end date.
How to use it
- Enter start date.
- Enter end date.
- Select Calculate (or Generate for random tools).
- Read the answer and any additional results below the form. Check the units and the limits of the method.
Formula and method
The dates are compared as midnight UTC values to avoid daylight-saving hour changes.
Worked example
Start date: 2026-10-08, End date: 2027-01-01. The result is 85 days (time between the two dates).
Assumptions and limits
Use the units and formats shown in the input labels. Actual conditions and applicable standards may differ from this simplified calculation.
Frequently asked questions
What inputs does the Date Calculator need?
Use start date, end date. Read the answer and any additional results below the form. Check the units and the limits of the method.
What assumptions apply to the Date Calculator?
Use the units and formats shown in the input labels. Actual conditions and applicable standards may differ from this simplified calculation.