DATE TOOLS
Day of the Year
Find the day number of any date (1–366), or which date a day number falls on.
Pick a date above.
How to use the Day of the Year
- Pick a date to see its day number, the days left in the year and how much of the year has passed.
- Or switch to “Day number → date” to convert a number such as 256 back to a calendar date — common in logistics, manufacturing and science (often called a 'Julian date').
Frequently asked questions
Is this the same as a Julian date?
In business and manufacturing, 'Julian date' often means the day of the year (for example 2026-281). Astronomers use 'Julian Day' for a continuous day count since 4713 BC — a different thing.
Does a leap year change the numbering?
Yes. From 1 March onwards, every day number is one higher in a leap year, and the year has 366 days.