Swine gestation calculator

Invalid input fails with invalid_input and is not billed.

How porcine gestation becomes a farrowing due date

This calculator encodes the planning convention used when the breeding day is known: due_date is breeding_date plus one hundred fourteen whole Gregorian days. It does not replace pregnancy diagnosis, ultrasound at mid-gestation, or a veterinarian's advice for an individual sow, and it never reads the server clock, so two machines in different time zones produce the same JSON for the same breeding day.

Input contract, calendar validation, and response shape

Years are accepted from 0001 through 9999 so historical farrowing records and future breeding plans share one parser. A leap-year breeding such as twenty twenty-four February twenty-ninth still lands on a real June day because the extra February day is counted. Failed validation is never charged. POST a JSON body with breeding_date, a real Gregorian calendar day in YYYY-MM-DD form. Aliases breed_date, mating_date, service_date, and date are accepted so farm-management spreadsheets and barn-office forms can map columns without renaming. The day must exist: twenty twenty-six February twenty-nine, month thirteen, and day thirty-two of April are all invalid_input, as are missing values, empty strings, and any shape that is not four digits, a hyphen, two digits, a hyphen, and two digits. On success the body echoes the normalized breeding_date, reports gestation_days as one hundred fourteen, returns due_date as the estimated farrowing day, and includes a short formula reminder. Example: breeding_date two thousand twenty-six January first yields due_date two thousand twenty-six April twenty-fifth because one hundred fourteen civil days after the first of January land on the twenty-fifth of April in a non-leap year. Successful API calls use prepaid balance at the published $0.002 base price with unit item.

Where a swine gestation calculator earns its keep

Commercial farrowing units use a swine gestation calculator to turn a recorded service or AI day into a crate-load deadline, a night-watch roster, and a calendar hold for the stockperson and the veterinarian. Smallholders and youth livestock projects estimate when a backyard gilt may farrow so a farrowing hut, heat lamp, and colostrum are ready before the first piglet. Prefer a dedicated days-between tool when you only need calendar distance without the porcine gestation model; prefer this capability when the output must be a farrowing point estimate from a known breeding day. The free browser tool runs entirely offline in your session; the API charges only successful solves at $0.002, keeps no durable copy of the breeding date after the response, and returns the same ISO fields every time so local goldens match production.