Bird Medley Calendar

Y. Martini By Entelognathus - Own work, CC BY-SA 4.0

Birds are the only living descendants of dinosaurs. Their ancestors belonged to the natural group of Euornithes which diverged from Archaeopteryx.

There are over 11000 species of birds today although many are under threat of extinction.

The months of the Bird Medley Calendar are named after birds. The first two months are 28 and 30 days long, then the following months follow the same pattern as the Gregorian calendar:

Months of the Bird Medley Calendar and their lengths

Jay	Finch	Macaw	Avocet	Mesia	Junco	Gull	Auk	Siskin	Owl	Noddy	Dove
28	30	31	30	31	30	31	31	30	31	30	31

That makes a regular year of 364 days or 52 weeks.

Leap Years

Every fifth year of the Bird Medley Calendar is a leap year, same as the Cacatua Calendar.

In a leap year Jay gains six days and becomes 34 days long. The length of the year is 370 days.

A double-leap year occurs when the year is leap both in the Gregorian Calendar and in the Bird Medley Calendar. That can only happen when the year is a multiple of 20.

In a double-leap year Jay gains seven days and becomes 35 days long. The length of the year is 371 days or 53 weeks.

On a leap year the months Macaw to Dove are aligned with the months March to December and the following year begins on the same day as the Gregorian calendar. The rest of the time Bird Medley months start before their Gregorian equivalent.

Beginning of the months in Bird Medley Calendar years 2000-2020

Year	Jay	Finch	Macaw	Avocet	...	Dove
2000	27 December	31 January	1 March	1 April		1 December
2001	1 January	29 January	28 February	31 March		30 November
2002	31 December	28 January	27 February	30 March		29 November
2003	30 December	27 January	26 February	29 March		28 November
2004	29 December	26 January	25 February	27 March		26 November
2005	27 December	30 January	1 March	1 April		1 December
2006	1 January	29 January	28 February	31 March		30 November
2007	31 December	28 January	27 February	30 March		29 November
2008	30 December	27 January	26 February	28 March		27 November
2009	28 December	25 January	24 February	27 March		26 November
2010	27 December	30 January	1 March	1 April		1 December
2011	1 January	29 January	28 February	31 March		30 November
2012	31 December	28 January	27 February	29 March		28 November
2013	29 December	26 January	25 February	28 March		27 November
2014	28 December	25 January	24 February	27 March		26 November
2015	27 December	30 January	1 March	1 April		1 December
2016	1 January	29 January	28 February	30 March		29 November
2017	30 December	27 January	26 February	29 March		28 November
2018	29 December	26 January	25 February	28 March		27 November
2019	28 December	25 January	24 February	27 March		26 November
2020	27 December	31 January	1 March	1 April		1 December

The same pattern repeats every twenty years, although Finch starts one day early when the year is multiple of 100 and not leap in the Gregorian calendar.

Day of the Week

All the years between two single leap years begin on the same day of the week.

First day of the year in a 400-year cycle:

International Month Names

Non-English speakers can choose different bird names for the months to suit their own language.

For example French speakers could use:

Jaseur, Fauvette, Manchot, Avocette, Mésange, Junco, Goéland, Autour, Sittelle, Outarde, Nette and Durbec.