User blog comment:The Koromo/Chapter 758 Review: Again/@comment-4493594-20140828204202/@comment-24638955-20140828230225

Technically speaking during Timeskip but confirmed he's able to use it was in Punk Hazard when Luffy spoke with the crew and Law about who could take on Ceasar and Luffy said Zoro and Sanji could.

Episode 594 of anime