Date of listing is not displayed on any profile because deals should be judged purely based on the merit of the business/profile and not based on the duration it is live on the platform. Deal-making is a typically a long drawn process and can take anywhere between a few weeks to a few years.
You can always Sort by "Recently Listed" on the Business for sale, Investors & Buyers, Franchises tab. In case you get connected with an opportunity that is no longer available, then kindly login to your dashboard and report the issue for that specific introduction.