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Custom Weekends Business Days Calculation IVF Tracking Public Holidays Skipping International Calendar Trimester Milestones Holiday Management Working Days Counter Job Postings Regional Support Gestational Age ACOG Redating Business Day Calculation Job Location Ultrasound Measurement Due Date Calculation Job Type Workday Careers Business Days Addition Job Date

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Antenatal Visit Schedule Dates API

Health & Fitness

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

Free 7-Day Trial

100% uptime MCP ready

Conception Date from LMP Calculation API

Health & Fitness

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

Free 7-Day Trial

100% uptime MCP ready

LMP Based Due Date Calculation API

Health & Fitness

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

Free 7-Day Trial

100% uptime MCP ready

Ultrasound Dating Based on Fetal Biometry API

Health & Fitness

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

Free 7-Day Trial

100% uptime MCP ready

Pregnancy Trimester and Term Milestones API

Health & Fitness

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

Free 7-Day Trial

100% uptime MCP ready

IVF Transfer Due Date Calculation API

Health & Fitness

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

Free 7-Day Trial

100% uptime MCP ready

Gestational Age Calculator and Week Conversion API

Health & Fitness

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

Free 7-Day Trial

100% uptime MCP ready

Pregnancy Due Date - Gestational Age API

Health & Fitness

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.

Free 7-Day Trial

100% uptime 809ms avg MCP ready

Workday Careers Job Postings API

Company Data

Job postings from a company Workday careers site, with title, location, type and date.

100% uptime MCP ready

ACOG Ultrasound Redating Rules API

Health & Fitness

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

Free 7-Day Trial

100% uptime MCP ready

Ovulation Date and Fertile Window Calculation API

Health & Fitness

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

Free 7-Day Trial

100% uptime MCP ready

Business Days Calculator API

Tools & Utilities

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

Free 7-Day Trial

100% uptime 398ms avg MCP ready

Business-Day API

Tools & Utilities

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.

Free 7-Day Trial