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From: "Josh Berkus" <josh@agliodbs.com>
Subject: Re: datediff?
To: Erwin Moller <erwin@dexus.nl>
Cc: pgsql-sql@postgresql.org
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Erwin,

> I read your FAQ: Working with Dates and Times in PostgreSQL with
> interest
> and was wondering if somebody came up with those datediff and dateadd
> functions?
> I couldn't find any at techdocs.postgresql.org.

I know somebody worked on one.  I take it you read the articles on SQL
Server ---> PostgreSQL conversion?  

The problem, as I recall, was one of quoted identifiers.  That is, for
datediff, you do:

DATEDIFF ( m, date1, date2 )

whereas a postgresql function would have to say

DATEDIFF ( 'm', date1, date2 )

I don't know if anyone ever worked out a way around this minor problem.

-Josh