如何在rails中验证日期？

rails new my_app
cd my_app
rails generate model Event name:string date:date

# app/models/event.rb
class Event< ApplicationRecord
  validates :name, presence: true
  validates :date, presence: true, date_format: { with: /\d{4}-\d{2}-\d{2}/ }
end

# app/controllers/events_controller.rb
class EventsController< ApplicationController
  def create
    @event = Event.new(event_params)
    if @event.save
      redirect_to @event, notice: 'Event was successfully created.'
    else
      render :new
    end
  end

  private

  def event_params
    params.require(:event).permit(:name, :date)
  end
end

<!-- app/views/events/_form.html.erb -->
<%= form_with(model: event, local: true) do |form| %>
  <%= form.label :name %>
  <%= form.text_field :name %>

  <%= form.label :date %>
  <%= form.date_field :date %>

  <%= form.submit 'Create Event' %>
<% end %>