Day of Week Calculator
Everyday Life
Find the weekday of a Gregorian date.
Formula
Read the UTC weekday for the selected calendar date.
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
Example Calculation
Example inputs
- Date: 2026-01-01
1 January 2026 is a Thursday.
Frequently asked questions
How do I use this calculator?
Enter date. The result updates automatically. Use Reset to restore the example values.
What method does it use?
Read the UTC weekday for the selected calendar date.. Follow the units and definitions shown with the inputs to apply this relationship consistently.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.