Example: Date: 2026-07-31 → Day of the week: Friday.
Day of the year: 212 of 365
Week number (approx.): 31
Frequently asked questions
How do I calculate day of the week? Enter your numbers above and the result updates instantly. For example: Date: 2026-07-31 → Day of the week: Friday.
Is this Day of the Week Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for day of the week. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.