What is an ordinal date?

An ordinal date is the year plus the day number within the year, for example day 60 of 2026. January 1 is day 1.

How many days are in the year?

A common year has 365 days and a leap year has 366. The calculator uses the correct total for the year you select.

Does the day number account for leap years?

Yes. In a leap year February 29 is counted, so dates from March onwards have a day number one higher than in a common year.

Date & Time Calculators

Day of Year Calculator

Find the ordinal day number of a date, days remaining and how much of the year has passed.

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Select a date

About the Day of Year Calculator

The Day of Year Calculator returns the ordinal day number of a date, where January 1 is day 1 and December 31 is day 365 or 366 in a leap year.

Alongside the day number it shows how many days remain in the year, the ISO week number, the calendar quarter and a progress bar for the percentage of the year that has elapsed.

Ordinal dates are widely used in data files, ordinal timestamps and scientific work. Every value is computed locally in the browser.

Key features

Ordinal day number from 1 to 366
Days remaining in the year
ISO week number and quarter
Percentage of the year elapsed

How to use

1Select a date.
2Read the day number out of the total days in that year.
3Review the days remaining, ISO week and quarter.

Examples

Day number

Input: March 1, 2026

Output: Day 60 of 365

January has 31 days and February 28 in 2026, so March 1 is day 60.

Frequently asked questions

What is an ordinal date?: An ordinal date is the year plus the day number within the year, for example day 60 of 2026. January 1 is day 1.
How many days are in the year?: A common year has 365 days and a leap year has 366. The calculator uses the correct total for the year you select.
Does the day number account for leap years?: Yes. In a leap year February 29 is counted, so dates from March onwards have a day number one higher than in a common year.