Free online tool
Day of the Year Calculator
Choose a date and quickly see which number it holds within the year.
What this tool does
The Day of the Year calculator finds the position of a date within the calendar, such as day 1, day 100 or day 365. It helps with planning, reporting, schedules and calendar checks.
It also shows how many days remain in the year and whether the selected year is a leap year, which is useful for February dates and annual counts.
How to use
- Use today or enter another date.
- Click calculate to see the day number.
- Also check days remaining and leap-year status.
Common uses
- organize schedules
- check report dates
- calculate remaining days
- verify leap years
Privacy and local calculation
The calculation is mathematical and runs in the browser without sending the entered date to a server.