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Recent glibc versions have made mktime() fail if tm_isdst is inconsistent with the prevailing timezone; in particular it fails for tm_isdst = 1 when the zone is UTC. (This seems wildly inconsistent with the POSIX-mandated treatment of "incorrect" values for the other fields of struct tm, so if you ask me it's a bug, but I bet they'll say it's intentional.) This has been observed to cause cosmetic problems when pg_restore'ing an archive created in a different timezone. To fix, do mktime() using the field values from the archive, and if that fails try again with tm_isdst = -1. This will give a result that's off by the UTC-offset difference from the original zone, but that was true before, too. It's not terribly critical since we don't do anything with the result except possibly print it. (Someday we should flush this entire bit of logic and record a standard-format timestamp in the archive instead. That's not okay for a back-patched bug fix, though.) Also, guard our only other use of mktime() by having initdb's build_time_t() set tm_isdst = -1 not 0. This case could only have an issue in zones that are DST year-round; but I think some do exist, or could in future. Per report from Wells Oliver. Back-patch to all supported versions, since any of them might need to run with a newer glibc. Discussion: https://postgr.es/m/CAOC+FBWDhDHO7G-i1_n_hjRzCnUeFO+H-Czi1y10mFhRWpBrew@mail.gmail.com
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/.