From a3021aafcecbc5225bf99f235db4130546d543c1 Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Sun, 21 Apr 2024 13:46:20 -0400 Subject: [PATCH] Make postgres_fdw request remote time zone 'GMT' not 'UTC'. This should have the same results for all practical purposes. The advantage of selecting 'GMT' is that it's guaranteed to work even when the remote system's timezone database is missing entries, because pg_tzset() hard-wires handling of that, at least in 9.2 and later. (It seems like it would be a good idea to similarly hard-wire correct handling of 'UTC', but that'll be a little more invasive than I want to consider back-patching. Leave that for another day when we're not in feature freeze.) Per trouble report from Adnan Dautovic. Back-patch to all supported branches. Discussion: https://postgr.es/m/465248.1712211585@sss.pgh.pa.us --- contrib/postgres_fdw/connection.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/contrib/postgres_fdw/connection.c b/contrib/postgres_fdw/connection.c index 603e043af4..33e8054f64 100644 --- a/contrib/postgres_fdw/connection.c +++ b/contrib/postgres_fdw/connection.c @@ -671,10 +671,12 @@ configure_remote_session(PGconn *conn) * anyway. However it makes the regression test outputs more predictable. * * We don't risk setting remote zone equal to ours, since the remote - * server might use a different timezone database. Instead, use UTC - * (quoted, because very old servers are picky about case). + * server might use a different timezone database. Instead, use GMT + * (quoted, because very old servers are picky about case). That's + * guaranteed to work regardless of the remote's timezone database, + * because pg_tzset() hard-wires it (at least in PG 9.2 and later). */ - do_sql_command(conn, "SET timezone = 'UTC'"); + do_sql_command(conn, "SET timezone = 'GMT'"); /* * Set values needed to ensure unambiguous data output from remote. (This