MonthDay

Month and day of birth, nothing else. LinkedIn never returns a birth year, so this is the whole fact rather than a partial date - contrast with PartialDate, which does carry a year.

Fields #

Absent is not null: a field we did not get is omitted rather than sent as an empty string, so you can tell "LinkedIn does not have this" from "this person left it blank".

Sample #

{ "month": 8, "day": 19 }