Rails - Jan 2012 - trouble in storing dates from localized form text fields...

[Rails 3.1.3 / ruby 1.9.2 ]

I am trying to manage localized dates and I don''t actually understand
how it''s managed w Rails 3.1 ... I thought there was no more issues w
I18n..

my locale is defined : I18n.locale  => :fr
I am using a localized version of  jQuery DatePicker , so it displays
selected dates in the text field like :   01/02/2012   (Feb first )
i.e.  ( in generated html):
<input id="start_shooting_date" class="text
hasDatepicker" type="text" value="01/02/2012" name="project[start_shooting_date]">

in my Project model , date validations are OK, then I store the
updated project
@project.update_attributes(params[:project])

and I get stored in the DB :   start_shooting_date: "2012-01-02
00:00:00"  (Jan 2nd)   rather than  "2012-02-01 00:00:00" ( Feb
first )

I''ll appreciated your feedback ...

I defined in environment.rb ( don''t know if necessary.. for input .
but it seems to be for output, or is it redundant with defaults .yml
files ?)
# if locale french
Date::DATE_FORMATS.merge!(  :default => "%d/%m/%Y" )

I also defined the I18n default format in the .yml files

fr:
  date:
    formats:
      default: "%d/%m/%Y"
      short: "%e %b"
      long: "%e %B %Y"
      full: "%A %d %B %Y"
  time:
    formats:
      default: "%d %B %Y %H:%M:%S"
      short: "%d %b %H:%M"
      long: "%A %d %B %Y %H:%M"
    am: ''am''
    pm: ''pm''

en:
  date:
    formats:
      default: "%Y-%m-%d"
      short: "%b %d"
      long: "%B %d, %Y"
      full: "%A %B %d, %Y"
  time:
    formats:
      default: "%a, %d %b %Y %H:%M:%S %z"
      short: "%d %b %H:%M"
      long: "%B %d, %Y %H:%M"
    am: "am"
    pm: "pm"

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[SOLVED]

don''t know if it''s the best solution, but it worked...
changed the date text_fields to text_field_tag, on output , set the
value in the controller, with I18n and local format
>> @start_shooting_date = I18n.l( @project[:start_shooting_date], :format
=> "%d/%m/%Y")
then on input , set the attribute value from the form field in the
controller, with I18n and local format
>> @project = Project.new(params[:project])  # on create
>> @project.attributes = params[:project] # on update
>> @project[:start_shooting_date] = 
I18n.l(params[:start_shooting_date].to_date, :format => "%d/%m/%Y")
>> if @project.save
this way, the dates are correctly saved in the DB with the
standard :db format but input/output in the form is in local format
"dd/mm/yyyy" ( also defined like this in localized DatePicker

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