Day of Year Calculator
Convert a date to its day-of-year number, or back again.
Works Offline
Privacy First
No Login
No API
Date → Day of year
Day of year → Date
Resulting date
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About the Day of Year Calculator
Find which day of the year a given date falls on (1-366), including days remaining in the year, or go the other direction and convert a day-of-year number back into a calendar date.
Examples
March 1, 2026
2026-03-01Output
Day 60 of 365Keyboard shortcuts
- Copy the main outputCtrl / ⌘ + Shift + C
- Download the resultCtrl / ⌘ + S
- Share this toolCtrl / ⌘ + Shift + S
- Reset the inputsAlt + R
- Open the tool search paletteCtrl / ⌘ + K
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Frequently asked questions
Version 1.0.0 · Updated 2026-08-07 · Runs entirely in your browser