📅 Day of Year Calculator — Ordinal Date
Pick a date to see its ordinal day (1–366), how many days are left after it, and the leap-year status of that year.
Input
Result
Year
Private by design. This tool runs entirely in your browser — nothing you enter or add is uploaded to any server.
How it works
- The date is read as a local calendar date, not a UTC timestamp.
- Day of year is the difference from January 1 of the same year, plus one.
- February 29 is included only when the year is a leap year.
Examples
- 2026-01-01 is day 1 with 364 days remaining.
- 2024-12-31 is day 366 because 2024 is a leap year.
- 2026-10-06 is day 279.
Frequently asked questions
Which timezone is used?
The date input is a calendar date. Day numbers are calculated from that year, month and day without shifting zones.
What counts as a leap year?
Years divisible by 4 are leap years, except century years, which must be divisible by 400.
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