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Day of the year

Today is filled in. Pick any date.

The day of the year counts from January 1 as day 1. Shipping, manufacturing and the military often write dates this way.

Julian date or ordinal date?

People often say “Julian date” for a year plus a day number, like 26305 for November 1, 2026. Astronomers use “Julian Day” for a running count of days since 4713 BC, which is something different. The calculator shows the year-and-day form.

Leap years

A leap year has 366 days: years divisible by 4, except century years not divisible by 400.

Common questions

What day of the year is it?

Today is filled in at the top.

How many days are in 2028?
  1. It is a leap year.
What is a YYDDD date?

Two-digit year plus three-digit day of the year: 27032 is February 1, 2027.