Postgresql 7.0 bug

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                        POSTGRESQL BUG REPORT TEMPLATE
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Your name		: Eric Prevost-Dansereau	
Your email address	: eric@esc.rosemere.qc.ca


System Configuration
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  Architecture (example: Intel Pentium)  	: Intel Pentium II

  Operating System (example: Linux 2.0.26 ELF) 	: Linux 2.2.13 ELF

  PostgreSQL version (example: PostgreSQL-6.5.1):  PostgreSQL-7.0

  Compiler used (example:  gcc 2.8.0)		: gcc 2.91.66


Please enter a FULL description of your problem:
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When I execute from psql: 
	SELECT '2000-04-03'::timestamp - '2000-04-02'::timestamp;

I get:
	 ?column?
	----------
	 23:00
	(1 row)

Why april 2nd, 2000 don't last 1 day (or 24 hours) ?






Please describe a way to repeat the problem.   Please try to provide a
concise reproducible example, if at all possible: 
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SELECT '2000-04-03'::timestamp - '2000-04-02'::timestamp;




If you know how this problem might be fixed, list the solution below:
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I don't have any idea