Day of the Year Calculator
See which day of the year a date is, and how many days are left.
About the Day of the Year Calculator
Enter a date to see its day number in the year, how many days remain and how much of the year has passed.
Day-of-year numbers (also called ordinal dates, or in some fields Julian dates) run from 1 on 1 January to 365, or 366 in a leap year. They're used in manufacturing date codes, science and logistics.
The formula
Day of year = date − 1 January + 1
Worked example
11 November 2026
- Day 315 of 365
- 50 days remain; the year is 86.3% complete
- In the leap year 2028, 1 March is day 61
Questions people ask
Is this the same as a Julian date?
People often call it that, but astronomers' Julian Day Number is a different, continuous count; see the Julian date converter.
What day number is 1 March?
Day 60 in a common year and day 61 in a leap year.
How do I read a date code like 26315?
Often year then day: 2026, day 315, which is 11 November. Check the manufacturer's format.