Rails3: model: query: parse dates using UTC (ruby 1.9 inside) (#4796)

Rails3: model: query: parse dates using UTC (ruby 1.9 inside) (#4796)

On Rails 3.0 and Ruby 1.8.7 in Japan (UTC+9), tests fails with following messages.

test_operator_date_equals(QueryTest) [test/unit/query_test.rb:206]:
<"(issues.due_date > '2011-07-09 14:59:59.999999' AND issues.due_date <= '2011-07-10 14:59:59.999999')
 AND (issue_statuses.is_closed='f')"> expected to be =~
</issues\.due_date > '2011-07-09 23:59:59(\.9+)?' AND issues\.due_date <= '2011-07-10 23:59:59(\.9+)?/>.

Contributed by Sylvain Utard.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@7591 e93f8b46-1217-0410-a6f0-8f06a7374b81