ja:
  errors:
    messages:
      invalid_date: "は不正な日付です。"
      invalid_time: "は不正な時刻です。"
      invalid_datetime: "は不正な時刻です。"
      is_at: "must be at %{restriction}"
      before: "must be before %{restriction}"
      on_or_before: "must be on or before %{restriction}"
      after: "must be after %{restriction}"
      on_or_after: "must be on or after %{restriction}"