[Rails] Rails 2.3.8 - What happens to a datetime field between a form being submitted and the controller receiving the params

I currently have a model that simply contains one datetime field:

class CreateElectricityReadings < ActiveRecord::Migration
def self.up
create_table :clocks do |t|
t.datetime :time_keeper
t.timestamps
end
end

def self.down
drop_table :clocks
end
end

If I enter the date string "13/10/2010" into this field its showing up
in the controller as params[:clock][:time_keeper] "2010-10-13 23:00:00
UTC". I've tried overloading
ActiveRecord::ConnectionAdapters::Column string_to_date(string) and
ActiveRecord::ConnectionAdapters::Column string_to_time(string) but
these seems to get hit when an object is saved not between the form
submitting and the controller receiving the params object. Where is
the mysterious 23:00:00 hours coming from? Can anyone point me to a
good piece of reference reading for how dates and times work in rails
land?

Thanks

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