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Problem in age on a dates interval

From: Luis Sousa <llsousa(at)ualg(dot)pt>
To: pgsql-sql(at)postgresql(dot)org
Subject: Problem in age on a dates interval
Date: 2004-07-16 08:45:24
Message-ID: 40F795A4.5030206@ualg.pt (view raw or flat)
Thread:
Lists: pgsql-sql
Hi all,

I'm using PostgreSQL 7.3.3 on i386-pc-linux-gnu, compiled by GCC gcc 
(GCC) 3.3 (Debian), and I don't understand the results of the following 
queries:


SELECT age('2004-05-14 16:00'::timestamp,'2004-02-18 16:00'::timestamp);
      age      
----------------
 2 mons 25 days

SELECT '2004-02-18 16:00'::timestamp+'2 mons 25 days'::interval;
      ?column?      
---------------------
 2004-05-13 16:00:00

In this case, the age from 2004-05-14 16:00 to 2004-02-18 16:00 is 2 
mons 25 days, but if I add the age to the initial date, it returns one 
day less!?



SELECT age('2004-05-26 16:00'::timestamp,'2004-02-18 16:00'::timestamp);
      age     
---------------
 3 mons 8 days

SELECT '2004-02-18 16:00'::timestamp+'3 mons 8 days'::interval;
      ?column?      
---------------------
 2004-05-26 16:00:00

Here, the age between 2004-05-26 16:00 and 2004-02-18 16:00 is 3 mons 8 
days, and this interval added to the initial date gives the correct result!!

Best regards,
Luis Sousa

Responses

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Next:From: Theodore PetroskyDate: 2004-07-16 11:52:14
Subject: Re: Problem in age on a dates interval
Previous:From: Jeff KowalczykDate: 2004-07-15 18:20:57
Subject: 'UPDATE OR INSERT' command

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