The Calendar 13 graphics have just been updated. If you miss the old Roman numeral design, please be patient. I will be adding the option of switching to Roman numerals in addition to the standard numbers currently being used. The older "star" heptagram type will be restored soon as well. This will be added in addition read more...

You may now obtain a printable calendar PDF for the year 2012. There are 14 pages (month 0 - 13) and each month's page includes the Gregorian date translations for the month making it easy for anyone to adopt! Print yourself the Calendar 13 calendar today and get started. The Gregorian dates are light enough to allow you read more...

Welcome to Calendar 13, a website devoted to a version of the 13 month, 28 day calendar developed by me (Cody Jassman).

It is a free concept for anyone's use or adaption as it is itself a borrowed idea. It is based on the 13 month, 28 day diagram created by John Michell in his book “The Dimensions of Paradise”. read more...