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The Essence of Insanity

Ramblings of a lunatic

The Clarentine Calendar

I just designed a new calendar! The first draft has been copied here; for the most recent version, check it out on Github.

The Clarentine Calendar

This is the formal specification for the Clarentine calendar. This document is a work is progress, it will change as feedback is incorporated.

All pronunciations shall follow the rules of Standard Clarentine English Pronunciation (will be published later; it’s still a work in progress).

NOTE: all numbers are written in base 10d/12e, or base-twelve


The fundamental unit of time in the Clarentine Calendar is the day. A day is defined they same way as in the UTC, including leap seconds.

Divisions of Time

There are two types of time periods: a division, and a subdivision. Divisions are converted to each other at a 1:10 ratio.


Name Plural Postfix form Composed of
Day Days dies UTC day
Month Months menses 10 days
Year Years anni 10 months


Prefix Number of divisions
tri- 3
quad- 4
hex- 6



  1. 3 days = 1 tridie
  2. 4 days = 1 quadie
  3. 6 days = 1 hexdie
  4. 10 days = 1 month


  1. 3 months = 1 trimenses
  2. 4 months = 1 quadmenses
  3. 6 months = 1 hexmenses
  4. 10 months = 1 year


This calendar uses the “J2000” epoch. The date 0-00 11:58:55.816 is defined as J2000, or 1 January 2000 11:58:55.816 UTC, or 1 January 2000 11:59:27.816 TAI (UTC and TAI times in decimal).


Date format:

“y*-md”, where “y*” is the year to as many digits as needed, “m” the month, and “d” the day.

All numbers are filled into the template from right-to-left, from the least significant to the most significant. All missing numbers are assumed to be the current division of time. The hyphen between the year and the month/day can be left out.

For example:

  1. 42 : Current year, month 4, day 2
  2. 3-56 : Current 10-year, year 3, month 5, day 6
  3. 1234-78 : Current 10000-year, year 1234, month 7, day 8
  4. 9ab: Current 10-year (and all above), year 9, month A, day B