Date the content expires and is no longer useful or available. For example a [[VideoObject]] or [[NewsArticle]] whose availability or relevance is time-limited, or a [[ClaimReview]] fact check whose publisher wants to indicate that it may no longer be relevant (or helpful to highlight) after some date.
Ожидаемые значения должны быть одного из этих типов
Date
Используется в таких типах
CreativeWork

Schema Version 1.1