Content dripping by date (calender date)

Hi, I am very interested in content dripping. And I made parts of what I want work with this code from your examples in the plugin and here: http://www.s2member.com/kb/intro-content-dripping-in-s2member/

// If the user has been paid for your site for at least 30 days
<?php if(S2MEMBER_CURRENT_USER_PAID_REGISTRATION_DAYS >= 30){ ?>
	Drip content to Members that started paying you at least 30 days ago.
<?php } ?>

I just want to have it a little different. This is what I want:

Instead of couting all 24 hours, it should drip the new content always after midnight, regardless of what time the user first has logged on. Right now as a new user comes into the system he is getting a time stamp:

Fri Nov 2nd, 2012 @ precisely 5:56 pm

In my example the user will get a new video page with content each and every day for 28 days. But as it is now, if I take the example from above the user enters at about 6 pm and watches day one and then the next day he wants to watch part two, he right now has to wait until 6 pm again, before seeing the new content.

BUT: I want it, so that with the NEW DATE (right after midnight), the new content is available. So that fixed to each calender date the user can see exactly one individual piece of content each and every single calender day, regardless of the time he first became a member.

How can I achieve this? Many regards, still testing, but I am really excited by this piece of software.

Looking foward to your answers,
Arnegger

Discussion has been continued here:
http://www.s2member.com/forums/topic/content-dripping-by-date-calender-date-2/