Day of the Year Calculator
Find which numbered day of the year a date is, and days remaining.
Which numbered day of the year is today? Day 1 is January 1, and by December 31 you're at day 365 (or 366 in a leap year). This ordinal day number appears in logistics, scientific data, spreadsheets and file naming, where a single number is tidier than a full date.
Pick any date and this tool tells you its day-of-year number, how many days remain in the year, and the year's total length. It correctly accounts for leap years, so late-February and later dates land on the right number.
How to use Day of the Year Calculator
- 1
Enter your date
Pick the date or date-time.
- 2
See the result
It updates instantly.
- 3
Use it
Copy or note the figures you need.
Features
- Instant calculation
- Handles leap years and month lengths
- Runs privately in your browser
Frequently asked questions
Common mistakes to avoid
- Confusing calendar quarters with a differing fiscal year.
- Forgetting the result reflects today's date and changes daily.
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