I think I've researched this enough, and was not able to find what I'm looking for.

Many people suggest using Clock app, but that doesn't do it.

I'm looking for an app, (it'd have to be 3rd party app, run from Cydia) that would be 'similar' to the calendar app, and would display a number on the springboard app icon, and countdown days to a given 'goal'.

It could be used for numerous different countdowns (Black Friday, Days to Graduation, Days to Christmas (for those Christians out there )

It would have to be a Cydia app, since in order for the countdown to continue (without daily running the app) it would continuously 'check and compare dates' and decrement the counter, accordingly...