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タイムゾーンの設定

application.rbに、タイムゾーンの設定を追記します。
【例】

application.rb

〜省略〜
    # Initialize configuration defaults for originally generated Rails version.
    config.time_zone = 'Tokyo'   #追記

    # 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.
〜省略〜