Day of week & day of year
Enter your numbers — the results update instantly.
Weekday—
Day of year313
ISO week number46
Leap year?✗
Worked example
Given: Date = 2026-11-09
Result: Day of year = 313; ISO week number = 46; Leap year? = ✗
How it is calculated
1. Enter the values you know. 2. The calculator converts them to base units and applies the formula. 3. The result is shown in the unit you choose.
Frequently asked questions
How do I calculate it?
Given: Date = 2026-11-09. Result: Day of year = 313; ISO week number = 46; Leap year? = ✗.
Is the calculator free and private?
Yes. It is free, needs no sign-up and runs in your browser — the numbers you type stay on your device.