gem 'rails-i18n'

$ bundle install

  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    config.load_defaults 5.2
    config.paths.add 'lib', eager_load: true
    config.time_zone = 'Tokyo'
    config.i18n.default_locale = :ja
    config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]

    # Settings in config/environments/* take precedence over those specified here.
    # Application configuration can go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded after loading
    # the framework and any gems in your application.
  end

<%= @post.updated_at.strftime("%Y year%m month%d day").to_s %>
<%= @post.updated_at.strftime("%Y/%m/%d").to_s %>
<%= @post.created_at.strftime("%H o'clock%M minutes").to_s %>
<%= @post.created_at.strftime("%H:%M").to_s %>

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