- Aristean Calendar
 - Explains the features of the proposed Aristean Calendar, including fixed dates of the Christian holy days. - Calendar Studies
- 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.
- Calendar Zone: Reform Calendars
- Annotated list of sites with proposed calendars and information about calendar reform.
- Common-Civil-Calendar-and-Time
- 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.
- Ecliptic Calendar
- The Ecliptic Calendar is designed to be a beautiful way of marking time in six scales.
- 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.
- New Calendar, A: Exploring Options for Calendar Reform
- Evaluates proposed calendar changes to determine whether they meet necessary criteria for useful calendar reform.
- 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.
- Tranquility Calendar
- Proposed calendar rooted in science. The Tranquility Calendar has fixed days of the week each month and 13 months named for scientists.
- Wikipedia: Calendar Reform
- Summary of motivations for calendar reform, with links to articles about specific calendar proposals.
- World Calendar
- 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.
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