Ordinal date
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An ordinal date is a calendar date typically consisting of a year and an ordinal number, ranging between 1 and 366, representing the multiples of a day, called day of the year or ordinal day number. T
Mission control center's board with time data, displaying coordinated universal time with ordinal date (without year) prepended, on October 22, 2013 (i.e.2013-295)
Doomsday rule
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The Doomsday rule, Doomsday algorithm or Doomsday method is an algorithm of determination of the day of the week for a given date. It provides a perpetual calendar because the Gregorian calendar moves
Ordinal date
…306 is the number of dates in March through December. This makes use of the fact that the formula correctly gives a month-length of 31 for January. "Doomsday" properties: With m = 2 n and d = m gives…
John Conway, inventor of the Doomsday algorithm