Port Bug Report: Error with date_part when checking month

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Monica Kroger
Your email address : krogerm(at)rocky(dot)edu

Category : runtime: back-end: SQL
Severity : non-critical

Summary: Error with date_part when checking month

System Configuration
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Operating System : RedHat 5.2

PostgreSQL version : 6.3

Compiler used : it came precompiled with RH5.2

Hardware:
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Linux localhost.localdomain 2.0.36 #7 Fri Feb 26 21:42:39 MST 1999 i586 unknown
P133, 64 Megs of RAM

Versions of other tools:
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Problem Description:
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When using the date_part function it seems to be off by a day.
It excludes the first of this month and includes the first of next month in the query.

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Test Case:
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Given a table(ice) with a date(eventstart) in it when I use a select as follows:
select * from ice where date_part('month', "eventstart")='6';
it will return all of the dates in June except if they're on 06-01-1999
It will also return all of the dates on July 1.

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Solution:
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