If they say he gets out on 3-23-20, that is less than three years so it appears they've included the good time credits all inmates get at the beginning of their bid.
https://www.inmateaid.com/ask-the-inmate/so-my-man-got-three-years-he-was-in-adlanto-ca-but-moved-him-to-west-valley-detention-center-n-gets-out-on-3-23-20-what-will-he-serve#answer
Accepted Answer Date Created: January 07,2019