Enter any date to find its day number of the year — from Day 1 (January 1) to Day 365 or 366. The Day of the Year Calculator shows you the ordinal day number, days remaining in the year, and whether the year is a leap year. Great for tracking progress through the year or looking up any historical or future date.
Day of the Year
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Days Remaining in Year
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Total Days in Year
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Leap Year?
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Week Number of Year
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Year Completed
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The day of the year (also called the ordinal date) is a number that tells you how many days have passed since January 1st, including that day itself. January 1 is Day 1, February 1 is Day 32, and December 31 is Day 365 (or Day 366 in a leap year).
A standard year has 365 days. A leap year has 366 days, with the extra day added as February 29. Leap years occur every 4 years, except for century years not divisible by 400 (e.g., 2000 was a leap year, but 1900 was not).
Add up the number of days in each month that has fully passed, then add the day number of the current month. For example, March 16 = 31 (Jan) + 28 (Feb) + 16 = Day 75 in a non-leap year. Our calculator does this automatically for any date you enter.
Simply open the calculator and it will pre-fill today's date for you, immediately showing the current day number, days remaining, and more. You can also manually enter any past or future date.
Subtract the current day number from the total number of days in the year. For example, if today is Day 75 and the year has 365 days, there are 365 − 75 = 290 days remaining. The calculator shows this automatically.
A leap year adds an extra day (February 29) to the calendar, making it 366 days long. Any date from March 1 onward will have a day number one higher in a leap year than in a regular year. The calculator automatically detects whether the selected year is a leap year.
People born on February 29 (a leap day) only have an exact birthday every 4 years. In non-leap years, they typically celebrate on either February 28 or March 1. February 29 corresponds to Day 60 in a leap year.
Yes — you can enter any date, past or future, and the calculator will correctly determine the day number for that specific year, accounting for leap years and the exact month lengths.