[postgres@pg ~]$ pg_controldata
Database system identifier: 7301135029075117750
postgres=# select to_timestamp(((7301135029075117750>>32) & (2^32 -1)::bigint));
to_timestamp
------------------------
2023-11-14 10:12:48+08
(1 row)
cd /pgsql15.4/data/base/1
ll PG_VERSION
-rw-------. 1 postgres postgres 3 Nov 14 2023 PG_VERSION