Day of Year Finder

Free day of year finder. Find what ordinal day number (1-365 or 366) any date is within its year. Perfect for planning and calculations.

Discover the ordinal day number for any date—is it day 1, day 100, or day 365 of the year? This tool shows exactly where any date falls in the annual calendar, accounting for leap years.

Common use cases

  • Planning events at specific points in the year
  • Julian date conversions for astronomy
  • Agricultural and seasonal planning
  • Tracking progress through the year
  • Scientific data logging by day number

How to use

  1. Select or enter any date
  2. View the day number (1-365 or 1-366 for leap years)
  3. See how many days remain in the year
  4. Check multiple dates to compare positions
  5. Copy the result for your calculations

FAQ

What is day of year?

It's the ordinal number from 1 to 365 (or 366 in leap years) showing the date's position within the year. January 1 is day 1.

How are leap years handled?

Leap years have 366 days, with February 29 being day 60 and all subsequent days shifted by one.

Is this the same as Julian date?

Day of year is sometimes called ordinal date. True Julian dates count days since a specific historical starting point.