Date Created
What this is
date-created is a relation declaring when an entity was first written into the system.
It is set at the moment of creation and never changed thereafter.
It is the entity’s own record of its origin — independent of any version control system.
date-created MUST be a valid Date: YYYY-MM-DD in UTC.
It MUST be set at creation and never subsequently modified.
It MUST reflect the date the entity was written, not the date it was committed or deployed.
It MUST NOT be updated when the entity’s content changes — that is date-modified.
It MUST NOT be inferred retroactively from git history — if an entity lacks date-created, add it with today’s date.