Typically it is used similary to EOL in Software. You know when PostgreSQL 15 goes EOL it is different from PostgreSQL 14 Same here - the change date is diffe

Typically it is used similary to EOL in Software. You know when PostgreSQL 15 goes EOL it is different from PostgreSQL 14 Same here - the change date is different for major versions - when you create new major version of product it gets change date adjusted.