- Wikipedia: List of Calendars
 - Index of Wikipedia entries about calendars and measurements of the year, including current, ancient, proposed, and fictional calendars. - Brief History of the Calendar, A
- Learn about the origins and evolution of the calendar, including how different cultures and eras have reconciled the lunar and solar cycles when measuring time.
- Calendar Mailing List
- Mailing list for discussion of social, historical, and philosophical dimensions of calendars and time reckoning. Subscribe to read or send messages.
- 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
- Comprehensive categorized calendar catalogue offering an annotated directory of web sites about calendars. Includes information about religious, celestial, and cultural calendars, as well as holidays and traditional events.
- CalendarHome.com
- Create a printable calendar for any month or year, or browse ready-made calendars with art, nature, sport, or religious themes. Also includes links to other online calendar resources.
- Calendars Through the Ages
- Illustrated history and FAQs for calendars around the world, including the Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan versions.
- Calendars, Interpolation, Gnomons, and Armillary Spheres in the Work of Guo Shoujing (1231-1314)
(PDF) - Research paper which traces the usage of zodiacal spheres and other instruments by Chinese astronomers. In PDF format.
- Calendopaedia
- Articles about specific calendars and calendar topics, including a comparison chart of various calendar systems. Learn about topics such as lunar and solar calendars, the Earth's orbit, and common terms in time measurement.
- Daily Calendar and Clock Page
- Today's date in various calendars and eras, with links to current information around the web. Includes details about the current time and phase of the moon.
- Date Calculator Page
- Calculates the number of days between two dates, or find out what the date will be a given number of days from now.
- Day Of Birth
- Find out on what day of the week you were born, as well as your astrological sign, how old you are, what season you were born in, how long until your next birthday, and how many days/hours/seconds you have been alive
- Ecclesiastical Calendar
- Enter a year and get the days and dates for several Ecclesiastical celebrations during that year, including Easter and the movable celebrations related to it.
- Frequently Asked Questions About Calendars
- Gives an overview of the Christian, Hebrew, Persian, and Islamic calendars, and considers other calendars such as the Mayan, the French Revolutionary, and the Chinese.
- Internet Public Library: Calendars
- Offers links to topical and audience-specific calendars, including religious and cultural calendars.
- ISO Week Date Calendar
- Interactive calendar based on the ISO 8601 standard for time measurement. Displays the current week and day of the year and converts dates to week-date format.
- Lakota Winter Counts
- Exhibit of the Lakota photographic calendars and interviews on the winter-count-keeping tradition. Includes a database of winter count images, video interviews, and a documentary about the Native American nation. From the Smithsonian.
- Multi-Year Calendar
- View calendars for any year or sequence of years since 1582, including selected holidays; in English, French, German, and Spanish.
- Rosetta Calendar
- Calendar conversion service converting dates into corresponding days in different systems. Find out what equivalent dates are in the Gregorian, Julian, or Hebrew calendars.
- Time and Date.com
- Guide to time zones and calendars around the world. Generate a calendar for a given year and country, convert times between time zones, and find countdowns to the next New Year's Day and other events.
- Virtual Perpetual Calendar
- Online calendar showing a whole year at a glance, as well as holidays and astrological information. Also includes calendar FAQs, information about units of time, and U.S. and Canadian holidays.
- VMSL: Calendars
- Online directory of date and time resources including free online calendar makers. Browse information about today's date in history, astrological events, and holidays and festivals.
- Walk Through Time: Ancient Calendars
- Read about the calendars used by ancient peoples across the globe to track the seasons and the movements of the sun and moon. Discusses calendars from the Egyptians, Babylonians, Mayans, and Aztecs. With illustrations.
- Wikipedia: Calendar
- Overview of calendar systems and types, with links to Wikipedia entries about specific calendars. Covers solar, lunar, and fiscal versions, as well as calendars currently used around the world.
- WikiProject Calendars
- User-created calendars showing dates and holidays worldwide, from Wikipedia. Includes Gregorian, Chinese, and Islamic calendar dates.
- Wong Kar-Wai Calendar Project
- Collection of monthly calendars (in print or desktop wallpaper form) inspired by the Hong Kong filmmaker.
- World Book Encyclopedia: Calendars
- Facts about calendars and their long history. Includes information about the Chinese, Islamic, Hebrew, and Christian church calendars, as well as early versions created by the Babylonians and Egyptians.
- Yahoo! Calendar
- Yahoo! Calendar is web-based calendar to help you organise your life online, which features auto reminders, invites, and religious holidays.
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