Date Driven Teacher website

I currently have a website residing at [[login to view URL]][1] that I use for my classroom.? I would like a few changes or to have a new site written in the following manner This site has a list on the right that is date dirven for the content.? I want to be able to enter topics and have them only displayed for either a specific date range, week or day number of the year. Currnetly the site allows uploads, however I would like to have a editor similar to [login to view URL] where I can place new content online, edit or remove existing content. This will be utilized in my classroom for daily riddles or challenge problems.? There would be the option for a "submit response" for each item as in the current site.? I'll attach the source code to the existing site and I would like to have comments as to writing a new site or just modifying the old one. The main differentce between the the existing site and what I want is the ability to ass items to be displayed on a specific day (such as day 210) where it will come back around the next year and a Editor for uploading and entering text similar to Blogger.com.? All other functions of the site should basically remain in tact.