Day of the Week Calculator
Trivia-grade utility with ISO week metadata included.
Day of the week
Sunday
- Full date
- July 20, 1969
- Day of year / ISO week
- 201 / 29
- Leap year?
- No
How the Day of the Week Calculator works
The calculation follows the standard method used across the US — no shortcuts, no hidden assumptions. Here is exactly what happens behind the scenes:
Frequently Asked Questions
How does the Day of the Week Calculator work?
Enter your numbers above and results update instantly using standard formulas, computed entirely on your device.
Is the Day of the Week Calculator free to use?
Yes — completely free with no signup required, and it works on phones, tablets, and desktops.
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