Does every year have 365 days?

No. A common year has 365 days, while a leap year has 366 days and includes February 29.

How is the day number calculated?

January 1 is day 1. Every following calendar date increases the number by one through December 31.

Does the list include holidays?

No. The calendar is country-neutral and lists dates, weekdays, ISO weeks, and days remaining without regional holidays.

Can I download the full list?

Yes. You can download the selected year as CSV or plain text, or copy the full or filtered list.

List of 365 Days – Complete Calendar by Day Number

Complete list of 365 days in a year

Use this interactive List of 365 Days to find the day number for every date from January 1 through December 31. Select any year to see its dates, weekdays, ISO week numbers, and the number of days remaining in the year. Leap years are detected automatically and contain 366 entries.

How to use the 365-day calendar

Select a year or use the previous, next, and today controls.
Search for a date, month, weekday, or day number.
Narrow the list with the month and weekday filters.
Choose a date format or enter a custom token pattern such as dddd, MMMM D, YYYY.
Copy the dates or download the complete calendar as CSV or plain text. The exports use your selected format.
Use Reset to return to the current year, clear filters, and restore the ISO date format.

What is a day number?

A day number, also called the ordinal date or day of the year, gives every date a sequential position. January 1 is day 1, February 1 is day 32, and December 31 is day 365 in a common year. In a leap year, dates after February 29 shift by one and December 31 becomes day 366.

Common years and leap years

Most years contain 365 days. A leap year normally occurs when the year is divisible by 4, adding February 29. Century years must also be divisible by 400: 2000 was a leap year, while 2100 will not be one. The tool applies these Gregorian calendar rules automatically.

Day-number ranges by month

In a common year, January covers days 1–31, February 32–59, March 60–90, April 91–120, May 121–151, June 152–181, July 182–212, August 213–243, September 244–273, October 274–304, November 305–334, and December 335–365. Leap years add one to every range after February.

Practical uses

Convert an ordinary date into its day-of-year number.
Build schedules, journals, fitness plans, and daily challenges.
Check how many days remain before the end of a year.
Prepare date columns for spreadsheets, databases, and reports.
Look up weekdays and ISO week numbers while planning projects.

Custom date-format tokens

Choose a ready-made format or build your own with YYYY or YY for the year, MMMM, MMM, or MM for the month, DD or D for the day, and dddd or ddd for the weekday. For example, dddd, MMMM D, YYYY produces Thursday, January 1, 2026.

Notes about ISO week numbers

ISO weeks begin on Monday, and ISO week 1 is the week containing the year's first Thursday. Because of that rule, dates near New Year's Day can belong to the previous or following ISO week-year. The displayed calendar date and day number always remain part of the selected calendar year.