Convert dates between 13 calendars and get Islamic, Jewish, Chinese and Persian holiday dates (Ramadan, Eid, Passover, Chinese New Year, Nowruz) for 1900-2100.

Access accurate public holiday data by country and year, including local names, holiday types, dates, regional coverage, and observance details.

Korean public holidays with substitute-holiday logic, plus accurate Revised Romanization of Korean text - in one fast, zero-dependency JSON API on a global edge. Check if any date is a public holiday, list a year's holidays, romanize Hangul, or get today's Korea date and holiday status. Lunar-solar conversion, the 24 solar terms and the sexagenary cycle coming in v1.1.

Accurate, lightweight and fast REST API for Jewish and Hebrew calendar holiday calculation, holiday lookup by key, upcoming holiday lookup, date range filtering, and keyword search across Gregorian

Unlock a world of celebration with the Holidays API! Dive into a treasure trove of festive data spanning 230+ countries. Delve into past revelries or plan ahead with future calendars. From public jubilations to religious observances and bank holidays, this API ensures your application is always in sync with global festivities.

Look up public holidays for 55 countries, calculate business day deadlines, find the next business day, export holidays to iCal, and more — all backed by versioned JSON data with no external dependencies at runtime. Covers 55 countries across Africa, Americas, Asia, Europe and Oceania for years 2024 to 2027.

Ultimate Chinese Calendar API is a tool that provides information related to the Chinese lunar calendar, also known as the Chinese lunisolar calendar. This calendar is used in several countries, including China, Taiwan, and Vietnam, and is based on the movements of the moon.

Streamline healthcare appointment scheduling by automatically considering Korea's public holidays for optimal patient management.

Get real-time updates on Korea's public holidays to plan your schedule effortlessly!

Stay organized with a comprehensive calendar of Korea's public holidays for personal or business use.

Pregnancy due date and gestational age API. EDD from LMP, conception, IVF transfer day, or ultrasound CRL. ACOG redating rules, trimester, and term milestones. Deterministic ISO 8601 dates.

Streamline your applications by retrieving accurate holiday calendar information effortlessly with our Retrieve Holiday Calendar Information API.

Quickly extract vital holiday schedule data for planning and analytics using our Holiday Schedule API.

Gestational age at any given date, returned as a 29w2d label and as total days.

Antenatal visit dates from the WHO 2016, NICE or ACOG published schedules, as calendar dates.

Ovulation estimate and 6-day fertile window from cycle length. Not contraceptive guidance.

Applies ACOG Committee Opinion 700 Table 1 to decide whether an ultrasound overrides LMP dating.

Due date from embryo transfer date. Day-3, day-5, day-6 and egg retrieval calculated separately.

Due date from last menstrual period using Naegele's rule, with 21-45 day cycle length correction.

Trimester boundaries, 24w0d viability, and four preterm and four term classes with their dates.

Dating from BPD, HC, AC and FL measurements in millimetres, using Hadlock 1984 equations.

Conception date from a last menstrual period or from a known due date, as ISO 8601 dates

Ensure timely project deliveries with the SLA Deadline Calculator, using global holidays for precise deadline calculations.

Calculate business days accurately while accessing global holiday data to optimize your workflows.

AI-powered Jewish content moderation API. Analyzes text across 7 Halachic compliance categories using Torah, Talmud, and Shulchan Aruch. Returns compliance score, severity level, and rabbinical notes.