"...send it to the dfile without having to input the dates. "

Looks like this is a different question than originally posted?

Seems that way to me.

So, check CPAN for modules with "Date" and/or "Time" -- after all, something needs to tell the script that you want Cron to run which dates to check...

Or, re-write your script with the ASSUMPTION that Crom will run it shortly after midnite; calculate the desired dates from gmtime or localtime, as appropriate.