Date index for Jan 2002

Hello,

I think I have found an Achievo bug. I have fixed it and
it works fine for me. I attach the patch.

The problem appears when you press the link: 'Go to
week view' in Time Registration -> Time Registration
page (under Administrate hour entries title). At botton
of the page appears an SQL error. It is related to
'GROUP BY' problems using PostgreSQL (I don't know
if they would appear in MySQL/Oracle also).

I'm using Achievo 0.7.3 + Apache 1.3.14 + PHP 4.0.4 +
PostgreSQL 7.1.2 + Debian 2.2.

Sergio