Release posts over time according to sign up date

Is this scenario possible?

A user signs up and every day they see a new post. So if User A signs up on the 20th and User B signs up on the 25th by the 30th User A would be on the 10th post and User B would be on the 5th post – all depending on the day they sign up. The posts are already written and ready to go, they just need to be released one day at a time according to sign up day.

Any help is appreciated!