show content depending on user's access

There is “last login time” (if I am not wrong with the name) feature, not sure if it is for Pro version only… But this is not enough for what you ask, needs also some custom code to compare last login time with the posts publishing times… If you can not create, I can build for you.

thanks for your reply, but I don’t find any “last login time” feature on s2member…
can you more specific, please? ??

here it says:
“The Last Login Time, is the time at which the Username last logged into the site. There’s nothing special about this”

source: https://www.s2member.com/codex/stable/s2member/api_functions/package-functions/#src_doc_s2member_last_login_time()

but it’s not what I’m looking for..

That is what you need. Now you know when the user reads the site last time. Now find is there posts, created later. If so, show him. Again, needs custom code.