I would like to be a ble to 'drip' content to subscribers by date'

By drip I mean make a post visible to a subscriber relative to the number of days they have been a subscriber.

I can do this on a weekly basis by using eMember membership plugin but it only works on a block of posts at a time. I would like to be able to do it daily.

So, is there (or can there be created) a date field that shows when someone became a subscriber and (if so) can I provide access by the number of days they have been around?

Thx

Dave