Syd Barrett left Pink Floyd in 1968.
- He played his last show with the band in January, and by April they officially announced his departure. The exact timeline is a little fuzzy (he drifted in and out for a few months), but 1968 is the year the band moved on without him.
Dave Gilmour was brought in earlier that year to cover for Barrett’s increasingly erratic behavior, so the transition wasn’t a clean break. But if you’re asking for the year, it’s 1968. No need to overthink it.