Calendar conversions use established mathematical algorithms (Metonic intercalation, Tabular Hijri, Coptic arithmetic). Festival and reading cycle data is drawn from canonical sources for each tradition. Islamic dates are tabular approximations; actual observance depends on moon sighting by religious authorities. African oral-tradition cycles are marked exploratory and represent scholarly reconstructions, not authoritative determinations.
Filter Traditions
Today
Jewish (Hebrew)
verified
Christian Liturgical
verified
Ethiopian (Ge'ez)
verified
Coptic (Martyrs' Era)
verified
Bahá’í (Badí')
verified
Indian National (Saka)
verified
Zoroastrian (Fasli)
verified
Yoruba / Ifa Week Cycle
exploratory
Scholarly reconstruction of Ifa oral-tradition cycle
Maya Long Count
verified
Maya Tzolk’in & Haab’
verified
Aztec / Mexica tonalpohualli
disputed correlation
No single accepted correlation constant exists for the Mexica count; Caso correlation shown.