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The Pataphysical Calendar[1] is a variation of the Gregorian calendar. The Collège de 'Pataphysique created the calendar[2] in 1949. The pataphysical era (E.P.) started on Jarry's birthday, 8 September 1873. When converting pataphysical dates to Gregorian dates, the appendage (vulg.) for vulgate ("common") is added.[3]

The week starts on a Sunday. Every 1st, 8th, 15th, and 22nd is a Sunday and every 13th day of a month falls on a Friday (see Friday the 13th). Each day is assigned a specific name or saint. For example, the 27 Haha (1 November vulg.) is called Occultation d’Alfred Jarry or the 14 Sable (14 December vulg.) is the day of Don Quichote, champion du monde.[4]

The year has a total of 13 months each with 29 days. The 29th day of each month is imaginary with two exceptions:[5]

  • the 29 Gidouille (13 July vulg.) is always non-imaginary
  • the 29 Gueules (23 February vulg.) is non-imaginary during leap years

The table below shows the names and order of months in a pataphysical year with their corresponding Gregorian dates and approximate translations or meanings by Hugill.[6]

Pataphysical year
Month Starts Ends Translation
Absolu 8 September 5 October Absolute
Haha 6 October 2 November Ha Ha
As 3 November 30 November Skiff
Sable 1 December 28 December Sand or heraldic black
Décervelage 29 December 25 January Debraining
Gueules 26 January 22 February Heraldic red or gob
Pédale 23/24 February 22 March Bicycle pedal
Clinamen 23 March 19 April Swerve
Palotin 20 April 17 May Ubu's henchmen
Merdre 18 May 14 June Pshit
Gidouille 15 June 13 July Spiral
Tatane 14 July 10 August Shoe or being worn out
Phalle 11 August 7 September Phallus

For example:

  • 8 September 1873 (vulg.) = 1 Absolu 1
  • 1 January 2000 (vulg.) = 4 Décervelage 127
  • 10 November 2012 (vulg.)(Saturday) = 8 As 140 (Sunday)


  1. "The pataphysical calendar". .
  2. Template:Cite report
  3. Hugill 2012, pp 21–22
  4. Brotchie 1995, pp 45–54
  5. Brotchie 1995 pp=45–54
  6. Hugill 2012, pp 21–22