rails/rails — Issue #4366: Advancing a Timestamp by -1*(UTC Offset) does not set dirty
Author: burke
Created: 2012-01-06 21:38:18+00:00
State: open

obj.timestamp #=> Fri, 16 Dec 2011 11:00:00 CST -06:00
obj.timestamp = "2011-12-16 17:00" #=> "2011-12-16 17:00"
obj.timestamp #=> Fri, 16 Dec 2011 17:00:00 CST -06:00
obj.timestamp_changed? #=> false

Related, in `config/application.rb`:

config.time_zone = 'Central Time (US & Canada)'

This is occurring in my production 3.1.3 app as well as a fresh 3.2 app.