Add an explicit comment about POSIX time zone names having the reverse

sign convention from everyplace else in Postgres.  I don't suppose that
this will stop people from being confused, but at least we can say that
it's documented.

diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml
index 507b4b6142c348dfc48d695b7c129fd29f916d3a..e1fb7d42493469ee325ad205b3a2822f718b9e29 100644 (file)
--- a/doc/src/sgml/datatype.sgml
+++ b/doc/src/sgml/datatype.sgml
@@ -1,4 +1,4 @@
-
+
 
  
   Data Types
@@ -2275,6 +2275,11 @@ January 8 04:05:06 1999 PST
      reasonableness of the zone abbreviations.  For example, SET
      TIMEZONE TO FOOBAR0 will work, leaving the system effectively using
      a rather peculiar abbreviation for UTC.
+     Another issue to keep in mind is that in POSIX time zone names,
+     positive offsets are used for locations west of Greenwich.
+     Everywhere else, PostgreSQL follows the
+     ISO-8601 convention that positive timezone offsets are east
+     of Greenwich.