I have a rails form that displays a date in a text_field:
<%= form.text_field :check_in_date %>
The date is rendered as yyyy-m
yyyy-m
ActiveSupport::CoreExtensions::Date::Conversions::DATE_FORMATS[:default] = '%m/%d/%Y'
<%= form.text_field :check_in_date, value: model.check_in_date.to_s %>