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Note: The following description applies both to Postgres-XC and PostgreSQL if not described explicitly. You can read PostgreSQL as Postgres-XC except for version number, which is specific to each product.
The view pg_timezone_names provides a list
of time zone names that are recognized by SET TIMEZONE,
along with their associated abbreviations, UTC offsets,
and daylight-savings status. (Technically,
PostgreSQL uses UT1 rather
than UTC because leap seconds are not handled.)
Unlike the abbreviations shown in pg_timezone_abbrevs, many of these names imply a set of daylight-savings transition
date rules. Therefore, the associated information changes across local DST
boundaries. The displayed information is computed based on the current
value of CURRENT_TIMESTAMP.