The following bug has been logged on the website:
Bug reference: 18372
Logged by: James Gilbert
Email address: jgrg@sanger.ac.uk
PostgreSQL version: Unsupported/Unknown
Operating system: Any
Description:
As far as I can tell, the documentation of the TZ and PGTZ environment
variables read by the PostgreSQL still behaves as described in the
documentation for version 7.4:
https://www.postgresql.org/docs/7.4/datatype-datetime.html#DATATYPE-TIMEZONES
but is absent from more recent versions.
James