Countdown Timer (Custom Plugin) For a Website

General information for the website: Property Website Description of every page/module: We need a developer to create a custom feature for one of our sites. There should be a countdown timer function within the website, which will be shown beside the property listings on the website; and when the timer counts down, an email will be sent a week before to the person who put up the listings. When the time is up, the listing will be removed from the site. If there is confusion, more information will be provided for clarity. Description of requirements/features: Countdown Timer Extra notes: