Loading dynamic content to a SWF by date/time? Scheduled content

Does anyone know a good way to load dynamic content to a flash banner ad that would be dependent on the date and time the ad is served?

For example:
On March 3rd 2pm est through March 4th 5pm est, display ad where the “name”, “start and end date of sale”, “related jpg image”, and “url link” will change based on data in an xml file or txt file?

The data in quotes would be dynamic. I guess the big thing is how do I determine the date, and serve up the correct info.

I am no coder so I am rough with Actionscript. If anyone can point me in the right direction or get me started I would really appreciate it.