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We'd glossed over most of this complexity for years, but it's hard to avoid writing it all down now, so that we can explain what happens when there's no "posixrules" file in the IANA time zone database. That was at best a tiny minority situation till now, but it's likely to become quite common in the future, so we'd better explain it. Nonetheless, we don't really encourage people to use POSIX zone specs; picking a named zone is almost always what you really want, unless perhaps you're stuck with an out-of-date zone database. Therefore, let's shove all this detail into an appendix. Patch by me; thanks to Robert Haas for help with some awkward wording. Discussion: https://postgr.es/m/1390.1562258309@sss.pgh.pa.us
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.
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