Calendar conversions use established mathematical algorithms (Hebrew and Coptic/Ethiopian arithmetic as given in Dershowitz & Reingold, Calendrical Calculations; civil tabular Hijri). Bahá’í Naw-Rúz and Twin Holy Birthday dates for 2015–2064 follow the table published by the Bahá’í World Centre with the Universal House of Justice’s letter of 10 July 2014. Before 2015 the calendar used a fixed 21 March; after 2064 this page shows 20 March as an approximation until the next official table is published, so Bahá’í dates from 2065 on may be off by a day. 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.
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Every calendar below is recomputed for the date you choose.
Today
Jewish (Hebrew)
verified
Christian Liturgical
verified
Ethiopian (Ge'ez)
verified
Coptic (Martyrs' Era)
verified
Bahá’í (Badí')
verified
Indian National (Saka)
verified
Julian
verified
The civil calendar of Rome and medieval Christendom, still used liturgically by several Orthodox churches.
Chinese sexagenary cycle
verified
Ten heavenly stems against twelve earthly branches; 60 is their least common multiple.
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.