Ordinal date

Today's date (UTC) expressed according to ISO 8601 [refresh]
Date2024-11-10
Ordinal date2024-315
Mission control center's board with time data, displaying universal time with ordinal date (without year) prepended, on 22nd October 2013 (i.e. 2013-295)

An ordinal date is a calendar date typically consisting of a year and an ordinal number, ranging between 1 and 366 (starting on January 1), representing the multiples of a day, called day of the year or ordinal day number (also known as ordinal day or day number). The two parts of the date can be formatted as "YYYY-DDD" to comply with the ISO 8601 ordinal date format. The year may sometimes be omitted, if it is implied by the context; the day may be generalized from integers to include a decimal part representing a fraction of a day.


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