From : dzone snippets and http://wiki.rubyonrails.org/rails/pages/HowToDefineYourOwnDateFormat
my_formats = {
:my_format_1 => '%l %p, %b %d, %Y',
:my_format_2 => '%l:%M %p, %B %d, %Y'
}
ActiveSupport::CoreExtensions::Time::Conversions::DATE_FORMATS.merge!(my_formats)
ActiveSupport::CoreExtensions::Date::Conversions::DATE_FORMATS.merge!(my_formats)
