🔢 Day of the Year Calculator
Find out which day of the year a date is — often used in manufacturing date codes, Julian-style dates and planning.
How the Day of the Year Calculator works
The days from January 1 to the date are counted, with January 1 as day 1. Leap years have 366 days.
Step-by-step calculation
- 1Pick a date.
- 2Days are counted from January 1 (day 1).
- 3See the day number, days left and the YYDDD code.
Worked example
November 14, 2026 is day 318 of 365, with 47 days left in the year (87.1% of the year has passed).
Day of the Year Calculator examples
| Date | Day of the year |
|---|---|
| Jan 1, 2026 | Day 1 of 365 |
| Feb 15, 2026 | Day 46 of 365 |
| May 1, 2026 | Day 121 of 365 |
| Jul 20, 2026 | Day 201 of 365 |
| Nov 27, 2026 | Day 331 of 365 |
Calculated as of January 1, 2026. Other inputs kept at the calculator's default values. Results calculated by this calculator.
Why use a Day of the Year Calculator?
Read manufacturing date codes, plan by day numbers or track the year's progress.
Important factors that can affect your results
- Leap years have 366 days.
- Some systems call this a "Julian date".
- Codes may use 2- or 4-digit years.
Frequently asked questions
Is this the same as a Julian date?
People often call the day-of-year number a "Julian date", but astronomers use Julian Day for a different, continuous count.
How do I write a YYDDD date code?
Take the last two digits of the year and the 3-digit day number: November 14, 2026 = 26318.
Related calculators
Last reviewed November 2026 · How we build and check our tools · Report a problem