What happened to the (dynamic) fixtures?

Hi, i've a fixture with some ruby code, something like this:

first:   attr1: text   attr2: <%= 3.days.ago %>

But now the <&= 3.days.ago %> doesn't return anymore the correct value, but nil. What happened? How can i put some dynamic text into the fixtures like N days ago ? Thanks

Found, it's kind a bug.. with a datetime attribute in the fixture the value must converted to the db format (to_s(:db)), otherwise a simple Time.now would return nil