Add to your application's Gemfile:
gem 'datetimepicker'
For barebones implementation, you only need to add the require CSS and JS to your application.
# application.js.coffee
#= require datetimepicker// application.css.scss
@import "datetimepicker"Then, in simple form, use :as => :datetimepicker
<%= simple_form_for @record do |f| %>
<% f.input :created_at, :as => :datetimepicker %>
<% end %>