the release date is whatever the Bureau of Prisons website says it is. the date posted there has already calculated the 15% good time credit. you can check here - https://www.bop.gov/inmateloc/
https://www.inmateaid.com/ask-the-inmate/hello-my-boyfriend-is-going-to-federal-prison-and-he-is-suppose-to-be-get-out-on-03-02-35-when-will-he-actually-get-out#answer
Accepted Answer Date Created: May 16,2021