What you need to do is to first become familiar with the Dreamweaver Extensions. You will find it under the Commands menu, click on Manage Extensions. This opens up the Extension Manager. Click on the help file and read through the instructions on using Extensions. Real easy.
Now that you are familiar with Extensions, go to the Macromedia site, http://www.macromedia.com/cfusion/exchange/ You can also open Dreamweaver, click on Insert, then click on Get More Objects at the bottom of the menu. This link will take you right to the correct section. Or from the Macromedia home page click on Developers and then Exchange. Here you will find lots of new Extensions, most are free, some cost. Look through the Dreamweaver Extensions section and you will find 2 or 3 Extensions for putting in a Date field on a web page. This is the easiest way to do it.
I think you will also find some other Extensions that you will want to add to your Dreamweaver as well, so spend some time here and see what is available.