Day of Year Calculator
Convert any date to its day-of-year number (1–365/366) with days remaining. Developers compute ordinal dates for logs and filenames — free, no signup, runs locally.
How to Use the Day of Year Calculator
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Frequently Asked Questions
What day number is today?
Enter the date: 1 January is day 1, 31 December is day 365 (366 in leap years). Log filenames like 2026-187 sort chronologically without parsing month names.
How many days are left in the year?
The tool shows remaining days alongside the ordinal — 15 October leaves 77 days in a common year. Sprint planners convert quarterly goals into day-numbers for countdown math.
Do leap years shift the numbers?
Yes after February: 1 March is day 60 normally, day 61 in leap years. The calculator applies the leap rule automatically — verify February inputs in century years.
Is my input stored anywhere?
No — everything computes locally in your browser. Nothing is uploaded and no signup is needed.
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Last updated October 2026