Terms
How the answers here may be used, how to credit them, the limits, and what is promised about the API and what is not. In force from 14 November 2026; published by Ayudh.
The pages, the JSON API, the calendar feeds and the MCP server may be read by anyone, with no key and no account. What they answer is free to use for yourself, your family and your community, and in any work that is not commercial.
To use the answers in a product or a service that is sold or earns money, write to the publisher first. The publisher is Ayudh.
The rules, the computed dates and times taken together as a collection, and the software that computes them belong to the publisher. A rule may be quoted with its ruling; the rules and the dates may not be copied in bulk or republished as a set.
Say where a date came from: name Ahargaṇa and link the address in the ruling's cite, which every ruling carries. Give a date with the place and the method it is for, as the answer does, and not as the date for everyone.
One address may make 60 requests a minute and 100 in any 10 minutes. Past that the answer is a 429 with a Retry-After header saying when to ask again. Cache what you read: an answer for a past day changes only when the engine or the ruleset does, and its ETag changes with it.
Within /v1 a change only adds: new fields, new paths, and new values in a list of named values (a new error code, a new reason). Nothing is removed or renamed, and no field changes its meaning. Write a client that passes over what it does not know.
A change that cannot be made that way goes to /v2. /v1 keeps answering for at least 6 months after /v2 is announced on the terms page and in /openapi.json.
The computed values are not frozen. A corrected rule or engine can move a date or a time; every answer names the engine and the ruleset that computed it, and its ETag changes when they do. The ruleset is a draft, and is versioned.
The dates here are computed, and a computed date can be wrong, or differ from the one your family, temple or community keeps. Nothing here is the ruling of a religious authority. Where an institution on record gives another date, the ruling's page names it; check what matters against the authority you follow.
The site and the API are provided as they are, without warranty of any kind, and may change or stop. How the dates are computed and how closely they have been measured is set out under Methods.