Who we are

Our team includes people interested in the reconstruction of the ancient calendars enriched with the corresponding festivals. We aim at the recovery of the ancient rhythm of the daily life in accordance to the perennial cycles of the eternal gods of Nature: the Sun and the Moon. Time in the ancient people, especially in Greece and Judea, was a cycle resonated with the movements of the two main celestial bodies, the Sun and the Moon. The great discovery of the 19-year cycle by Meton, developed further by Callippus and Hipparchus, is a miraculous achievement based on refined astronomical observations and mathematical calculations. This cycle of years, each year lasting 12 or 13 months, complemented with the festivals in favour of the great gods and protectors of the cities, created a repeated series of events. The life of cities was inseparable from these events and it is impossible to comprehend the daily life and habits of our ancestors without the calendar cycle of these festivals.

What we do

This site concerns the Sacred Time of the someday used ancient calendars (like Athenians) as well as the until now used religious calendars of various people. You can find here an accurate correspondence between the now used dates of the Gregorian Calendar (New Style) and these of the previous Julian Calendar (Old Style), the reconstructed ancient Attic (Athenian) Calendar (from 812 BC to 25000 AD), the ancient Roman calendar, the valid until now religious Hebrew Calendar (3761 BC until 25000 AD), the Hijri (Islamic) Calendar (from 622 AD), the Coptic Calendar (from 284 AD), the Ethiopian Calendar (from 8 AD), the Armenian Calendar (from 552 AD), the Baha'i Calendar (from 1844 AD), the Persian & the Afghan Pastu & the Kurdish Calendars (from 622 AD), the Armenian Calendar (from 522 AD), the Indian Civil Saka Samvat Calendar (from 78 AD), Traditional Lunar Hindu Calendar (from 2011 to 2030 AD), the Traditional Lunar Chinese Calendar (from 2011 to 2030 AD), the Bikram Sambat (BS) Nepali Calendar, the Japanese Calendar (from 1873 AD) and Mayan Calendar (from proleptic Julian 3114 BC). The date of today is presented in all of them. Additionally you have the ability to convert any date (from proleptic Julian Calendar before 46 BC or Julian Calendar or the contemporary Gregorian Calendar) to any of the above mentioned Calendars. Besides, you can select any year for analytical full ancient Attic, Hebrew, Hijri (Islamic), Coptic, Ethiopian, Armenian, Baha'i, Persian, Afghan Pastu, Kurdish, Indian Civil, Traditional Lunar Hindu Calendar, Traditional Lunar Chinese Calendar, Japanese and Mayan Calendars. Besides the Easter Catholic and Orthodox date is given for any year. After all you can resort to any of the presented calendars according to your religion for information about the religious dates, or possibly to revive a someday used calendar as your own, if you are attracted by their gods or ceremonies.

Why to select our site

This is the only site, where you can find an integrated reconstruction of the ancient Attic (Athenian) Calendar. We considered as the year 1 of the 1st Meton cycle the actual beginning of Meton-cycles: 432 BC. We extended the calendar 20 cycles to the past in order to have the opportunity to use the Attic calendar for the definition of some certain dates recorded in the ancient texts (as the eclipse foretold by Thales, which has been identified with 28 May, 585 BC in proleptic Julian Calendar). The dates given before the summer solstice of 432 BC consist the proleptic Attic Calendar. We have used an algorithm for the estimation of the first day of each attic year (first new moon after the summer solstice), based on the ‘Molad Tohu’ algorithm for the determination of the first day of the Hebrew years. It is examined against the really occurred new moon and the estimation is indeed successful, failing in at most 1 plus/minus day. We also note that the corrections of Callippus (every 76 years) and Hipparchus (every 304 years) to the Meton cycle have also been taken into account.
Another unique feature of this site is the selection of the country or region before the conversion process, so that the then valid calendar (Old Style Julian or New Style Gregorian) is used, since the adoption of the new calendar occurred in different times in European regions and their overseas states. Any date (either New Style or Old Style) is given also in the other style. Besides Old Calendarists (in Orthodox groups in Greece etc) can find here either the equivalent New Style date of their used date or inversely to convert the officially used date (Gregorian date) into their Old Style date. Additionally Orthodox/ Catholic Easter dates are given for any year from 325 AD (Synod of Nicaea).
Last but not least is the ability to have full year calendas for any year, now for all the above mentioned calendars

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