- Aztec Calendar - Shows you the current date according to the sacred Aztec calendar. Gives a reading of the significance of the day and the relevant gods.
- Ethiopian Calendar - Discusses which calendar Ethiopia uses and gives a list of the month's names and public holidays in Ethiopia.
- The French Revolutionary Calendar - Convert any date since 1792 to the Jacobin calendar, a calendar that came out of the French Revolution but was ultimately not permanently adopted.
- Religious Calendars and Holy Days - Explanations of the Christian, Jewish, Muslim, Hindu, Buddhist, Sikh, Bahai, and Wiccan calendars. Also includes a list of holidays associated with these calendars.
- Several Calendars - Learn some basic information about the Egyptian, Roman, Gregorian, Mayan, Islamic, Jewish, and Julian calendars. Also learn how to calculate Easter.
- The Moon's Phase - Online calculator that lets you see which phase the moon is in for any date in any year.
- Virtual Perpetual Calendars - Lets you know what any calendar looks like for the 20th and 21st centuries. Also includes holidays, leap years, which years a particular day of the week always falls on, and methods of calculation.
- Zoroastrian Religious Calendar - Three versions of the Zoroastrian calendar from the most ancient to more modern calendars.
- TimeandDate.com: Calendar - All 12 months, plus lunar phases and some holidays noted.
- Calendars Through the Ages - Discusses currently used and unused calendars such as Chinese, Christian, Indian, Islamic, Jewish, Ethiopian, Balinese, Bahai, the French, Mayan, Roman, and some modern schemes for calendar reform. Includes timelines and all about how our week came into b
- The Current Calendar System - Learn about our current calendar, daylight saving time, old clocks, new and atomic clocks, and when the millennium begins.
- Leap Year - The Forest Preserve District of Cook County Illinois explains leap year.
- Algebra - Fun with Calendars - Perform some mental "magic" tricks based on math and the calendar.
- Years - How a year is figured and who invented our calendar.
- Phase of the Moon - Calendar showing the phase of the moon for this month or a month/year of your choice.
- Cosmic Calendar - Imagine if the history of the universe, all 13 billion years of it, were put into just one year. What would that calendar look like? Carl Sagan, the famous astronomer, made this one.
- Time and Date Calendar: - This site includes lots of information that is time and date related, such as yearly and monthly calendars, counters, countdown, and the world clock which shows current time in cities all over the world.
- History of the Calendar - How different parts of the world made different kinds of clocks based on where they lived and what kind of weather they had to predict.
- The Ancient Calendar - The ancient calendar, its origin, problems, and development, plus a look at the names of days of the week
- Counting: Calendars and Cords - A look at the methods ancient civilizations used to keep track of time.
- Calendars: Counting the Days - World Book Encyclopedia takes a look at calendars, including the history of calendars, and educational activities that relate to calendars.
- Japanese Calendar - Converts Japanese to Western calendar dates.
- Calendopaedia - All about calendars, different kinds, astronomical time, and how years are counted.
- Calendar Studies - Articles on the Gregorian and Julian calendars, the ISO date format, the Julian day number system, the Maya calendar, the Goddess lunar calendar, the Liberalia Triday Calendar and C functions for date conversion; plus software for calendrical conversion.
- Today's Date - Today's date from the Gregorian calendar that we use into the calendar dates of the Mayan, French, Islamic, Hebrew, Julian, Ethiopic, Coptic, Chinese, Julian, and Discordian calendars.
- Date Algorithms - Provides descriptions, proofs and computer programming implementation examples to convert dates to various calendar dates for Julian, Gregorian, and Rata Die calendars.
- Western-Chinese Calendar Converter - Tool to convert between the traditional Chinese lunar calendar and the Western solar calendar. Also offers a brief description of the two different calendars and lists links about the Chinese calendar.
- Indian Moons - A list of many American Indian tribe's names for months, days, and other calendar related information.
- Calculate the Day of the Week - Shows a method to calculate the day of the week for any past or future date. Computer based methods are also shown.
- Calendar, a History - A history of the western calendar, including the Gregorian and Julian and Roman Calendars, and how the days of the week and months got their names, and a history of time.
- Counting the Days - World Book Encyclopedia takes a look at calendars, including the history of calendars, and educational activities that relate to calendars.
- Regional Islamic Calendar - The months of the Islamic calendar and when they occur in the Americas, Europe-Africa-Asia, and Asia-Pacific.
- Royal Observatory at Greenwich - Leap Years - Learn why we have leap years.
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