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
This one use location, in your form:
<%= f.text_field :date3, value: ( l @model.date3 if @model.date3? ) %>
In locations en.yml (or es.yml)
en: date: formats: default: "%d/%m/%Y"