Day of Year Calculator
Free online day of year calculator. Find the day number for any date, days remaining in the year, and leap year status instantly.
About This Free Online Day of Year Calculator
Our free online day of year calculator instantly shows you the day number (1-365 or 1-366) for any date. It also displays the day name, week number, how many days remain in the year, and whether the year is a leap year. Useful for project planning, tracking annual milestones, calculating ordinal dates for data processing, and understanding calendar structure.
Features of Our Day of Year Calculator
- Day number (1-365/366) for any date
- Days remaining in the current year
- Leap year detection
- Week number and day name display
- Real-time update as you change date
- 100% free and private
How to Use the Day of Year Calculator
Using this tool is simple and requires no signup or registration. Follow these steps:
- Select a date using the date picker or click Today.
- View the day number, week number, and day name.
- Check days remaining in the year.
- Copy the result formatted as text.
Frequently Asked Questions About Day of Year Calculator
What is the day of year?
The day of year (also called ordinal date or Julian date) is a number from 1 to 365 (or 366 in leap years) representing the sequential day count within a calendar year. January 1 is day 1, February 1 is day 32, and so on.
What is a leap year?
A leap year has 366 days instead of 365, with an extra day on February 29. Leap years occur every 4 years, except for century years not divisible by 400 (e.g., 1900 was not a leap year, but 2000 was).
How many days are in each month?
January 31, February 28/29, March 31, April 30, May 31, June 30, July 31, August 31, September 30, October 31, November 30, December 31.
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