I think you need to explain more what you mean when you say "running current date" and "use it to bounce off values". I have no idea what you want to do.
You can always make sure you have a global field in some utility table, and have the script that starts the report use SetField that field to place the current date in that field with Get (CurrentDate) before continuing with the report. The report can then use that field for anything you want.
Thank you for your post.
The answers provided by "ralvy" is correct (Thank you!) However, if you just want to display the date, put two slashes on the layout ( // ), and it will display today's date. However, you would not be able to do any kind of calculations with it.