The release date is entered by the members/users of the site. When the sentence is over they are usually released into a halfway house or probation/supervised released for a period determined by the Courts.
https://www.inmateaid.com/ask-the-inmate/are-the-inmate-profiles-accurate-on-the-days-they-have-left-to-serve#answer
Accepted Answer Date Created: April 27,2016