Day of Year Calculator | Which Day of the 365/366 is it?
Calculate the day of the year (1-366) for any date. See how many days remain in the year.
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About Day of Year
What is the Day of Year?
The day of the year (also known as ordinal date) is a number from 1 to 365 (or 366 in leap years) indicating the position of a specific day within a calendar year.
Leap Years
A standard year has 365 days. A leap year, which occurs every four years (with exceptions per century rules), has 366 days. February 29th is the extra day, affecting the ordinal position of all dates from March 1st onwards.
Usage
Ordinal dates are widely used in astronomy, agriculture (for planting seasons), military logistics, and programming (Julian days computations).