rails/rails — pull request #6619 by kennyj (2012-06-04 09:40:45+00:00)
Title: Fix #6591 Rails 3.2.5 Regression: incorrect _changed? for datetimes

There is a problem when dealing with Time with Timezone field.
If value is not change, definitely _will_change! method is executed.

Please see https://github.com/rails/rails/issues/6591.

I'll submit this PR to 3-2-stable.