Date calculation produces wrong output with 7.02

Mark Stosberg (mark(at)summersault(dot)com) reports a bug with a severity of 3
The lower the number the more severe it is.

Short Description
Date calculation produces wrong output with 7.02

Long Description
I use Postgres nearly every day and am very appreciative of the project.

I think this example will my bug:

[PostgreSQL 7.0.2 on i686-pc-linux-gnu, compiled by gcc 2.96]
cascade=> select date(CURRENT_DATE + ('30 days'::reltime));
date
----------
9097-10-20

#############

It's quite likely my "date math" syntax is wrong, but it seems that Postgres should either return the right result, or let me know something is fault.

Sample Code

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