BAQ Report print dialog customization

I set up a baq report print dialog with two option fields of data type date for entry of a date range. As it is, both fields show the current date by default. I want to initialize them to the date range of the current fiscal period. I think a customization script would work but I'm not very good at it yet. Does anyone have a customization script like this that they're willing to share?

Thanks,
Reggie Acosta