Bill Stewart, and a few other hosts, recorded and stored their shows at AFRTS-LA for four to six months prior to air. Although the programming was 5-55:00 at the beginning, it was considered "ever green" by the LA producers. Bill Stewart never mentioned "it's the Monday edition" or "it's the Tuesday edition" the way Roger Carroll did for his 5-55:00 series. I believe this was due to the inordinate delay in recording the Bill Stewart Shows. He just didn't know what day the show was to be aired!
When Bill Stewart says "this song is a new release", it really isn't. . .it's four to six months old. (Notes from https://afrtsarchive.blogspot.com/)