Day of Year Calculator
Calculate which day of the year a specific date falls on.
Frequently Asked Questions
What is the day of year calculation used for?
Day of year calculation is used in fields such as historical records, astronomy, accounting, and project planning. January 1 is the 1st day of the year, and December 31 is the 365th (or 366th in a leap year).
Does a leap year affect the calculation?
Yes, in leap years, February has 29 days, so March 1 and later dates shift forward by 1 day compared to a normal year. The total number of days in a leap year is 366.
Is this the same as a Julian Day Number?
No, this calculation gives the sequential day number within the year (ordinal date). The Julian Day Number is a continuously incrementing astronomy reference number starting from 4713 BC.
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