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

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

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

The Global API delivers seamless date and business day calculations worldwide, catering to international business needs.

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

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.

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

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

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

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.

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.

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

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

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

The Domain Age and Registration Date API provides the age and registration date of a domain for informed decision-making.

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

The Domain Age Tracker API offers insights into the age and registration date of a domain, aiding in making well-informed decisions based on accurate historical data.

The Domain Age Explorer API provides details on the age and registration date of a domain, helping users make informed decisions with precise historical information.

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.

Gain a competitive edge by researching domain age nuances with our comprehensive API for informed decision-making.

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

The Domain Age Insight API provides information about the age and registration date of a domain.

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

Validate transaction dates against Korea's public holidays, ensuring compliance and smooth fintech operations.