2012-07-10 is now more than 2 years ago

```
    When I am on the search works page
    When I fill in "Date" with "> 2 years ago"
      And I press "Search" within "form#new_work_search"
    Then I should see "4 Found"
```
That test was failing because there are now five works with a revised_at date of more than 2 years ago. (third work's revised_at date is 2012-07-10, so it just had a birthday.)