Religious observances, sourced and dated

Know when every faith’s dates fall, and why.

A calendar of religious observances for the people who have to schedule around them, and a reference to the traditions behind them. Every date says how much it can be relied on. Every statement shows the quotation it rests on.

See the 2026 calendar Browse the traditions

11traditions covered

67observances in 2026

26statements, each quoted

14sources checked daily

The traditions

Each one uses its own word for its subdivisions, because using the wrong word is the first thing a reader from that tradition notices.

Christianity

around 2.4 billion · 11 denominations

Islam

around 1.9 billion · 3 branches

Hinduism

around 1.2 billion · 4 traditions

Buddhism

around 500 million · 3 traditions

Judaism

around 15 million · 7 movements

Sikhism

around 26 million · 5 traditions

Bahá'í Faith

around 8 million

Jainism

around 5 million · 2 traditions

Shinto

Not meaningfully countable

Taoism

Not meaningfully countable · 2 schools

Zoroastrianism

around 120,000 · 2 communities

Why the dates are hard

Easter is computed twice

Western churches use the Gregorian computus and most Orthodox churches the Julian one, so the two dates usually differ. We give both.

Days begin at sunset

Jewish and Islamic observances start the evening before. A booking made for the Gregorian day alone misses the half people need off.

The moon is sighted locally

Eid depends on an announcement, so two communities in one city can observe it on different days. Our dates are given per country.

Diwali moves by the tithi

It falls on the new moon that holds at dusk, computed from the pañcāṅga. We compute it rather than copying a list.

Some dates cannot be computed

Where a date turns on an announcement we have not seen, we say so. An admitted gap beats a confident guess.

Sources are checked daily

Every quotation on the site is re-checked against its source. When one stops matching, the statement comes down by itself.

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