Collection of articles about calendars, including the Julian and Gregorian calendars, ISO date format, lunar calendars, and the number of days in a week. Includes several proposed new calendars.
Perpetual Calendar, The
Article about the process of switching from the Julian to the Gregorian calendar, with a table showing when each nation made the transition.
Home Page for Calendar Reform
Dedicated to the study of changes in the calendar, with ideas for future calendar reform and information about historical reforms.
Wikipedia: Calendar Reform
Summary of motivations for calendar reform, with links to articles about specific calendar proposals.
Describes the World Calendar, a 12-month, perennial calendar with equal quarters, and explains the advantages of this calendar, which stays the same each year.
Information about the proposed calendar reform called Common-Civil-Calendar-and-Time (C&T), which stays the same each year by inserting an extra week in some years.
Proposed calendar rooted in science. The Tranquility Calendar has fixed days of the week each month and 13 months named for scientists.