Calendars and Timekeeping Websites

Information such as yearly and monthly calendars, counters, countdown, and the world clock which shows the current time in cities all over the world.

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.

The encyclopaedia of calendars.

Complete guide to times in every time zone in the world.

The calendar was the center of Maya life and their greatest cultural achievement. To carry out their astronomical calculations they developed a sophisticated mathematical system. The Maya Calendar website is developing with the intent of providing a complete view of Maya culture.

Extensive descriptions of many timing systems, with information on time zones and Julian day numbers.

Second full moon in a month, or third full moon in a single season.

The mathematics and rule explanation for the calendar.

The mathematics of the calendar in Singapore.

Questions and answers to satisfy the hearts of true millennium buffs.

History and FAQs of calendars, from ancient Rome to outer space. Including Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan.

A proposal for a non-sectarian, culturally neutral calendar system.

Applets related to calendars and keeping time, including sidererial time.

An explanation of the calendar including the origin of the day, week, month and year.

The worldwide interactive online astronomical/space calendar and calculator - for friends of astronomy, as well as astronomers.

Lunar calendar with lunations, from new moon to new moon, instead of months. Moon phase on each day. Chinese, Jewish, and Islamic months. Eclipses, meteors, planets, star charts. Christian, Pagan, Islamic, Hindu, and Jewish holidays.

Explanations of the Julian Calendar, the Gregorian Reform, the adoption of the Gregorian Calendar, the length of the tropical year and related matters.

An explanation of the Julian day number system used by astronomers and calendricists.

An explanation of lunar, solar, lunisolar, rule-based and other calendars.

A productivity toolkit for global users and businesses that includes world clock and calendar.

Explains the cosmological and astronomical influences in creating the Indian calendar.