Home/Date & Time/Day of the Year Calculator

Day of the Year Calculator

Enter any date to find out which numbered day of the year it is, counting from January 1 as day one through to 365 or 366 on the final day. This ordinal day number, sometimes loosely called the Julian day of the year, shows up in scheduling, agriculture, science logs and file naming, and it is surprisingly awkward to work out by hand once you are deep into the calendar. Alongside the day number the tool shows how many days remain in the year and what percentage of the year has already passed, which is a neat way to track progress toward annual goals. It handles leap years automatically, so late February and beyond stay accurate. The date defaults to today and updates as you change it, with all of the math done locally in your browser.

How to use Day of the Year Calculator

  1. Enter any date.
  2. Read its day number of the year.
  3. Check the days left in the year and the percentage elapsed.

Frequently asked questions

What is the day of the year?

It is the ordinal position of a date within its year, from 1 for January 1 up to 365, or 366 in a leap year for December 31.

Does it show how much of the year is left?

Yes. It shows the days remaining in the year and the percentage of the year already elapsed.

Does the tool account for leap years?

Yes. In a leap year the maximum day number rises to 366 because of the extra day in February.

What is Day of the Year Calculator?

Enter any date to find out which numbered day of the year it is, counting from January 1 as day one through to 365 or 366 on the final day. This ordinal day number, sometimes loosely called the Julian day of the year, shows up in scheduling, agriculture, science logs and file naming, and it is surprisingly awkward to work out by hand once you are deep into the calendar.

Is Day of the Year Calculator free to use?

Yes. Day of the Year Calculator is completely free, with no sign-up and no usage limits.

Does Day of the Year Calculator work in a web browser?

Yes. Day of the Year Calculator runs in any modern web browser. There is nothing to download or install.

Is my data private with Day of the Year Calculator?

Yes. Day of the Year Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.