[SQL] date_part bug?

[Salvador Mainé]

Hello:

I'm using postgres 7.0.2. When I use date_part('day', date) sometimes I
get wrong values. Ie: 
and date_part('day', '1999-3-28')=27

and date_part('day', '2000-3-26')=25

Is it a bug? Is there any SQL equivalent function?

-- 
Salvador Mainé

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