| 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. |
| 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 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. |
| 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. |
| 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 being. |
| Calendopaedia | | All about calendars, different kinds, astronomical time, and how years are counted. |
| 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. |
| Date Algorithms | | Provides descriptions, proofs and computer programming implementation examples to convert dates to various calendar dates for Julian, Gregorian, and Rata Die calendars. |
| Ethiopian Calendar | | Discusses which calendar Ethiopia uses and gives a list of the month's names and public holidays in Ethiopia. |
| 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. |
| Indian Moons | | A list of many American Indian tribe's names for months, days, and other calendar related information. |
| Leap Year | | The Forest Preserve District of Cook County Illinois explains leap year. |
| Regional Islamic Calendar | | The months of the Islamic calendar and when they occur in the Americas, Europe-Africa-Asia, and Asia-Pacific. |
| 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. |
| The Ancient Calendar | | The ancient calendar, its origin, problems, and development, plus a look at the names of days of the week |
| 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. |
|
|
