Ruby's time zone detection does not agree with PostgreSQL sometimes

On PostgreSQL 84, Postgres seems to detect the local timezone differently than Ruby does. When selecting dates from PostgreSQL, it automatically converts the date to the local timezone. Unfortunately, the way it detects the current UTC offset is different than the way Ruby does. That means that when the date is parsed by ruby, it ends up with the wrong offset.

I've attached a patch that fixes the test, but it's important that people make sure to do one of the following:

1) Always use UTC timezones in rails

2) Make sure that Ruby and PostgreSQL agree on the machine's timezone