Day of Year Calculator
Which day of the year a date is — ordinal day, days remaining, leap-year status and a year-progress bar.
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What Is the Day of Year Calculator?
The Day of Year Calculator converts any date to its ordinal day (1–365, or 366 in leap years), shows the days remaining, the ISO week, leap-year status and a year-progress bar. Ordinal dates are the single-number day format used in logistics, astronomy and embedded systems.
How It Works
Pick a date or press Today — every value updates instantly.
When to Use It
Use it for ordinal date formats (YYYY-DDD), countdown planning, pro-rata calculations, or settling what percent of the year has passed.
Frequently Asked Questions
- Is This The Julian Date?
- It's the day-of-year that people often casually call a Julian date; the astronomical Julian Day is a different continuous day count from 4713 BC.
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