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From: momjian(at)postgresql(dot)org (Bruce Momjian - CVS)
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql-server/src backend/utils/adt/timestamp.c ...
Date: 2003-03-20 06:03:01
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-committers
CVSROOT:	/cvsroot
Module name:	pgsql-server
Changes by:	momjian(at)postgresql(dot)org	03/03/20 01:03:01

Modified files:
	src/backend/utils/adt: timestamp.c 
	src/test/regress/expected: horology-no-DST-before-1970.out 
	src/test/regress/sql: horology.sql 

Log message:
	Attached is a patch that limits the range tested by horology to
	what is capable using integer-datatime timestamps. It does attempt
	to exercise the maximum allowable timestamp range.
	Also is a small error check when converting a timestamp from external
	to internal format that prevents out of range timestamps from being
	Files patched:
	Index: src/backend/utils/adt/timestamp.c
	Added range check to prevent out of range timestamps
	from being used.
	Index: src/test/regress/sql/horology.sql
	Index: src/test/regress/expected/horology-no-DST-before-1970.out
	Index: src/test/regress/expected/horology-solaris-1947.out
	Limited range of timestamps being checked to
	Jan 1, 4713 BC  to Dec 31, 294276
	In creating this patch, I have seen some definite problems with integer
	timestamps and how they react when used near their limits. For example,
	the following statement gives the correct result:
	SELECT timestamp without time zone 'Jan 1, 4713 BC'
	+ interval '109203489 days' AS "Dec 31, 294276";
	However, this statement which is the logical inverse of the above
	gives incorrect results:
	SELECT timestamp without time zone '12/31/294276'
	- timestamp without time zone 'Jan 1, 4713 BC' AS "109203489 Days";
	John Cochran

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