I\'ve been working with a rails form all day and I was just randomly testing it and tried the date 25/12/2009 and it came up with a huge error.
It was at this point
In your settings file: config/environment.rb"
my_date_formats = { :default => '%d/%m/%Y' }
ActiveSupport::CoreExtensions::Time::Conversions::DATE_FORMATS.merge!(my_date_formats)
ActiveSupport::CoreExtensions::Date::Conversions::DATE_FORMATS.merge!(my_date_formats)
source: http://thedevelopercorner.blogspot.com/2009/03/change-default-date-format-in-ruby-on.html