What is this calculator?
Find the weekday for any valid calendar date.
What can you use it for?
Use it for practical planning, conversions, measurement or checking the result described here. Find the weekday for any valid calendar date.
How to use it
- Enter calendar 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
Convert a Gregorian calendar date to its weekday
The entered date is validated before the calendar lookup.
Worked example
Calendar date: 2026-10-08. The result is Thursday (day of the week).
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 Day of the Week Calculator need?
Use calendar 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 Day of the Week Calculator?
Use the units and formats shown in the input labels. Actual conditions and applicable standards may differ from this simplified calculation.