Find the exact day number (1-366) of the year for any date. Instant, mobile-friendly ordinal date tool for developers, scientists, and project planners.
Day of Year
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What is the Ordinal Date?
The “Day of the Year” refers to the number of days that have passed since January 1st. It is a vital metric in technical fields where standard month/day formats are too complex for calculations.
Programming & API Logs
Software developers often use ordinal dates in file naming and logging systems to simplify sorting and database queries.
Leap Year Calculation
Our tool automatically accounts for leap years, correctly identifying February 29th as day 60 and shifting subsequent days accordingly.
Supply Chain & Agriculture
Used extensively in manufacturing batch codes and planting cycles where seasonal counting is more important than the calendar month.
Fast Facts
- Non-Leap Year: Dec 31st is Day 365.
- Leap Year: Dec 31st is Day 366.
- The Midpoint: In a regular year, Day 183 is July 2nd.