#Omission

module App
  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    config.load_defaults 6.0 

    #Japanese language setting
    config.i18n.default_locale = :ja
    #Japan time setting
    config.time_zone = 'Tokyo'

    #Omission

config/locales/ja.yml =>Create

ja:
  time:
    formats:
      default: "%Y/%m/%d %H:%M:%S"
      #Since it is the default to the last, set with a pattern that seems to be used often

l sample.created_at =>Display with default settings

sample.created_at.strftime('20%y year%m month') => "20xx yy month"

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