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Day of Year Calculator
Use this day of year calculator to find the ordinal day number of any date, the number of days remaining in the year, and whether the year is a leap year.
Day of Year0
Selected Date—
Days in Year365
Days Remaining0
Leap YearNo
Weekday—
How to Use the Day of Year Calculator
Select a date to find its ordinal position within the year.
Practical Example
January 31 is day 31, while December 31 is day 365 in a common year and day 366 in a leap year.
Factors That Affect the Result
The selected year and whether it is a leap year determine day numbers after February.
Frequently Asked Questions
What is day of year?
It is a number from 1 through 365 or 366 identifying a date’s position in the year.
Do leap years change the result?
Yes, dates after February shift by one day in leap years.
Is January 1 always day 1?
Yes.