A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
The problem with Cliff's suggestion is that the time display in PowerPoint isn't live: it only updates when you open the file, then it's stuck on that time. If Cliff had tested the solution first, that would have been clear.
Does your educational license include desktop versions of Office, or is it online only?
In desktop versions, you can create VBA macros that update the time. Here's an example from Stack Overflow, please scroll down the Answer for a working solution.
If you're using the online-only version, choose Home>Add-ins>More Add-ins and search for clock. There are several such add-ins, see which one may serve your purposes.