#calendar

The calendar patterns equity traders position around — "Sell in May", the Santa Claus rally, the September swoon — computed live from ~10 years of Yahoo Finance monthly data across the world's major stock indices (no key, nothing stored). Equities have well-documented seasonal tendencies, and this measures them directly: for each index it takes a decade of monthly returns, groups them by calendar month, and returns the average return in each of the twelve months, the share of years that month was positive (the win rate), and the historically strongest and weakest months. The seasonality endpoint returns one index's full 12-month seasonal profile plus the current month's historical bias. The month endpoint flips it around: for a calendar month it ranks every index by its historical average return, so you can see which markets are seasonally strong or weak right now. The indices endpoint lists what is covered, from the S&P 500, Nasdaq, Dow and Russell to the DAX, FTSE, CAC, Euro Stoxx, Nikkei and Hang Seng. The equity-index seasonality / calendar-pattern cut — distinct from the FX, commodity and crypto seasonality APIs, the index price feed and the constituent APIs.

api.oanor.com/indexseasonality-api

The calendar patterns commodity traders position around, computed live from ~10 years of Yahoo Finance monthly futures data (no key, nothing stored). Commodities are the most seasonal market there is: natural gas tends to rally into winter heating demand, gasoline into the summer driving season, grains around the planting and harvest calendar. This measures it directly — for each commodity it takes a decade of monthly returns, groups them by calendar month, and returns the average return in each of the twelve months, the share of years that month was positive (the win rate), and the historically strongest and weakest months. The seasonality endpoint returns one commodity's full 12-month seasonal profile plus the current month's historical bias. The month endpoint flips it around: for a given calendar month it ranks every commodity by its historical average return, so you can see what is seasonally bullish or bearish right now. The commodities endpoint lists what is covered. The commodity-seasonality / calendar-pattern cut — distinct from the FX-seasonality API (currencies), the commodity-price feed, the commodity-spreads and the commodity-momentum APIs. It answers what a commodity usually does this month, not what it costs today.

api.oanor.com/commodityseasonality-api

The "who built it and what is on its calendar" view of a cryptocurrency, served from the public CoinPaprika feed. The coin endpoint returns the project's identity and technical profile — market-cap rank, coin-or-token type, whether it is active, the genesis date, development status, consensus / proof type, hashing algorithm, organisation structure, the open-source flag and its industry tags. The team endpoint returns the people behind the project — names and roles such as founders, authors and leads. The events endpoint returns the project's event calendar — conferences, mainnet launches, exchange listings and milestones, each with a date and a link, newest first. This is the project-and-people view of a coin — its team, profile and calendar, not its price — distinct from the price-feed, market and CoinGecko-profile APIs in the catalogue. A coin is a CoinPaprika id (btc-bitcoin); a bare symbol (btc) or name (bitcoin) is resolved automatically to the best-ranked match. Live, no key on the upstream, nothing stored.

api.oanor.com/cryptoprojects-api

Live US corporate-events calendar from Nasdaq — no key, nothing stored. The earnings and stock-splits calendar: which companies report earnings on a given day and which stocks are about to split, distinct from the economic-calendar, IPO-calendar and dividend APIs in the catalogue. The earnings endpoint returns every company reporting on a date — ticker, name, the consensus EPS forecast, the reporting time (before market open or after market close), market cap, the number of analyst estimates, the fiscal quarter ending and the prior-year EPS and report date — ranked by market cap. The splits endpoint returns the upcoming stock splits: ticker, name, the split ratio and the execution date. Build earnings-season dashboards, event-driven trading bots, investor-relations trackers and "who reports today" widgets on top of real Nasdaq calendar data. The earnings endpoint defaults to today (US Eastern) and accepts any date; EPS and market cap come back as clean numbers and reporting time is normalised to pre-market, after-hours or unspecified.

api.oanor.com/earnings-api

The live pipeline of US stock-market initial public offerings, served from Nasdaq's public IPO calendar — no key, nothing cached. This is the deal flow of companies going public, the data IPO investors and traders watch. The priced endpoint returns the IPOs that have just priced and begun trading, each with the ticker, company, exchange, offer price, shares offered, pricing date and total deal size. The upcoming endpoint returns the IPOs expected to price soon, with their price range and expected date — the near-term pipeline. The filed endpoint returns companies that have newly filed to go public, the earliest signal of a coming listing. The calendar endpoint returns the whole month in one call — priced, upcoming and filed — with counts. Any month back through the archive can be requested, and with no month it returns the current one. Everything is live from Nasdaq, nothing stored. This is the IPO-pipeline layer for any trading, investing, screener or finance app. Distinct from stock-quote and earnings APIs — this is the calendar of companies coming to market: priced, upcoming and freshly filed offerings. 4 endpoints, no key on our side.

api.oanor.com/ipo-api

Live corporate-events calendar for US-listed stocks — the dates that move markets — served straight from Nasdaq's public calendar feed. For any trading day it answers the three questions a trader's calendar needs. The earnings endpoint lists every company reporting on a date with the session (pre-market or after-hours), the consensus EPS forecast, the number of analyst estimates, market cap and the year-ago actual EPS — so you can see, for example, Oracle reporting after the close with a $1.58 consensus against $1.35 a year earlier. The dividends endpoint gives the dividend calendar: the ex-dividend, record and payment dates, the per-share rate and the indicated annual dividend. The splits endpoint gives the stock-split calendar with the split ratio and execution date. This is the forward event-calendar layer every trading, portfolio, screener, earnings-tracker and finance app needs — read live from Nasdaq, nothing cached or stored. Pass any date as YYYY-MM-DD, or omit it for today. Distinct from price, quote and fundamentals APIs — this is the forward calendar of corporate events: who reports, who pays, who splits, and when. 4 endpoints.

api.oanor.com/marketcalendar-api

Computus and calendar maths as an API, computed locally and deterministically. The easter endpoint computes the date of Easter Sunday for any year — both the Western date, by the Anonymous Gregorian (Meeus/Jones/Butcher) algorithm, and the Orthodox date, by the Julian computus converted to the Gregorian calendar — with the month name and weekday; Easter is the first Sunday after the paschal full moon, so 2024 falls on 31 March in the West and 5 May for the Orthodox church, while in 2025 both coincide on 20 April. The movable-feasts endpoint returns the whole Easter-anchored cycle for a year as calendar dates — Ash Wednesday (−46 days), Palm Sunday (−7), Maundy Thursday (−3), Good Friday (−2), Ascension (+39), Pentecost (+49) and Corpus Christi (+60). The julian-day endpoint converts a Gregorian date to its Julian Day Number — the continuous day count astronomers use, where 2451545 is 1 January 2000 — and back, returning the weekday too. Years are in the Gregorian calendar. Everything is computed locally and deterministically, so it is instant and private. Ideal for calendar, scheduling, liturgical, church, holiday-planning and date-arithmetic app developers, movable-feast and Julian-day tools, and almanac software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is the computus and Julian-day conversion; for general date arithmetic and time zones use a date-time API.

api.oanor.com/easter-api

Expand and describe RFC 5545 recurrence rules — the RRULE that powers calendar repeats. The expand endpoint takes an RRULE and a start date-time and returns the next occurrence dates, correctly handling FREQ (daily, weekly, monthly, yearly and the finer hourly/minutely/secondly), INTERVAL (every 2 weeks…), COUNT and UNTIL, BYDAY including ordinals like 2MO or -1FR (so "the last Friday of the month" or "the third Sunday of June"), BYMONTHDAY including negatives (-1 for the last day of the month), BYMONTH and WKST. The describe endpoint turns a rule into a plain-English sentence such as "every week on Monday, Wednesday and Friday, 10 times". Everything is computed locally in UTC and deterministically, so it is instant, private and identical on every machine. Ideal for scheduling and booking systems, calendar and reminder apps, billing and subscription cycles, job and report scheduling, and showing customers when something next happens. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This expands the recurrence rule; to build a downloadable .ics calendar event use an iCalendar API, and for plain date arithmetic use a date-time API.

api.oanor.com/rrule-api

Build a valid RFC 5545 iCalendar (.ics) event from simple parameters — and get ready-to-use "add to calendar" links for Google, Outlook, Office 365 and Yahoo. Pass a title, start and end (ISO 8601 or unix timestamps, in UTC) — or a duration in minutes, or an all-day flag — plus optional location, description, URL, organizer, an RRULE recurrence (e.g. FREQ=WEEKLY) and a reminder (a VALARM N minutes before). The service returns the fully-formed .ics text with correct escaping and 75-octet line folding, a base64 data: URI you can drop straight into a download link, and the four calendar deep-links. A second endpoint parses raw .ics text back into structured JSON events. Everything is computed locally with no network calls, so it is fast and deterministic. Built for booking and scheduling flows, event pages, email "add to calendar" buttons, reminders and no-code automations. A calendar-event builder — distinct from date/time math (datetime), public-holiday data (holidays) and the Jewish calendar (hebcal). No upstream key, no cache.

api.oanor.com/ical-api

The Jewish calendar as an API — powered by Hebcal. Convert any date between the Gregorian and Hebrew calendars (with the formatted Hebrew date and the Jewish events falling on that day), list the Jewish holidays of any year — major and minor festivals, Rosh Chodesh and special Shabbatot — each with its English and Hebrew name, date and category, and get this week's Shabbat candle-lighting time, Torah portion (parashah) and Havdalah time for any location by GeoNames id or coordinates. From Rosh Hashanah and Yom Kippur to Passover, Shavuot and Hanukkah, with Hebrew dates rendered in Hebrew script, it is ideal for calendar, scheduling, event, religious and cultural applications. A Jewish-calendar resource — distinct from secular public-holiday and Islamic prayer-time APIs. Open data from Hebcal (CC-BY 4.0 / GPL).

api.oanor.com/hebcal-api

Islamic prayer times, the Hijri calendar and the Qibla direction as an API. Get the five daily prayer times — Fajr, Dhuhr, Asr, Maghrib and Isha, plus sunrise, sunset, Imsak and midnight — for any coordinate and date, calculated with your choice of method (Muslim World League, ISNA, Umm al-Qura, Egyptian, and many more), alongside the matching Hijri date; convert any date between the Gregorian and Hijri (Islamic lunar) calendars in either direction; and get the exact Qibla direction — the compass bearing and great-circle distance from any location to the Kaaba in Mecca. Prayer times and calendar conversion are powered by the Aladhan service; the Qibla is computed directly. Ideal for Muslim prayer and lifestyle apps, mosque and community sites, Ramadan tools and calendars, and any app that needs accurate prayer times or Hijri dates. Open data.

api.oanor.com/prayer-api

Historical events, notable births and deaths, and holidays for any calendar date — "on this day in history" — relayed live from Wikipedia. Get today's curated highlights, or pass any date (e.g. 07-20 → Apollo 11 Moon landing among the events) to retrieve notable events, births, deaths, holidays/observances, or the editor-selected highlights. Every entry carries the year, a one-line description and a link to the relevant Wikipedia article. Ideal for "today in history" widgets, daily-content apps, trivia, newsletters and educational tools.

api.oanor.com/onthisday-api

Everything about the Moon from one fast, fully-local API. Get the current (or any date) lunar phase with illumination percentage, age in days, phase angle and waxing/waning state, plus the matching emoji; list the upcoming principal phases (new, first quarter, full, last quarter) with accurate UTC timestamps; render a full monthly lunar calendar; and look up the Moon’s zodiac sign and ecliptic longitude. Phase instants are computed with Jean Meeus’ astronomical algorithms and are accurate to about a minute. Every endpoint takes an optional ISO date and works by GET or JSON POST. Pure server-side compute with no third-party upstream, so responses are instant and always available. Ideal for calendar and weather apps, photography and astronomy tools, gardening, fishing and astrology features.

api.oanor.com/moon-api

Public holidays for 120+ countries — by year, the next upcoming holidays for a country, and the list of supported countries. Each holiday includes the date, English and local name, scope (national/regional) and type. Ideal for HR, scheduling and booking systems.

api.oanor.com/holidays-api