Decode tire sizes, compare sizes with speedometer error, load/speed ratings, DOT 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

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.

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

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

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

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

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.

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

Convert dates between Gregorian, Hebrew, Islamic and Chinese calendars; holidays by year.

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

Domain Date Reveal API delivers the exact domain age, registration and expiry dates—perfect for SEO, market research, and digital due diligence.

Instantly discover how old a domain is, including years, months, days, registration date, and expiration, in a structured, easy-to-use format.

Horoscope Date API is a powerful tools that provide developers with access to a vast database of astrological information, including horoscopes, zodiac signs, and other related data.

Domain Age API returns the creation date of any domain, helping determine its age, credibility, and online presence history.

Trust our Reliable API for consistent date and business day calculations, ensuring you never miss a deadline again.

Accurate business-day, holiday, and scheduling math for major countries and their subdivisions — without maintaining a single holiday calendar yourself. Add or subtract working days, check if a date is a business day, find the next valid date, or count working days between two dates, with full support for regional subdivisions, custom weekends, and your own blackout dates. One simple GET call, instant JSON.

Get precise results every time with our Accurate API for calculating dates and business days—perfect for business professionals.

Libera.Date.Api is a high-precision date calculation engine designed to streamline business logic for global applications. Its core strength lies in its advanced Working Days System, which accurately calculates business days by automatically excluding weekends and public holidays for multiple countries (including 100 countries). Beyond simple duration checks, the API offers intelligent scheduling tools like finding the nearest available working day, analyzing date ranges for non-working intervals, and distinguishing between standard weekends and legal holidays. Whether you are computing SLAs, planning delivery windows, or building HR rosters, Libera.Date.Api ensures your dates align with real-world business calendars.

Enhance your scheduling with the Smart API, designed to simplify date and business day calculations with intelligence.

Retrieve detailed domain age, registration, and expiration information to assess credibility, trust level, and longevity in a straightforward JSON format.

Access timely domain age metrics to enhance your digital marketing campaigns and elevate your online presence.

Count working days between two dates or add business days to a date, skipping weekends and public holidays of 100+ countries and regions.