The responses to my last question, “When did Lee Harvey Oswald decide to shoot President Kennedy?” have converged on a consensus: November 19, 1963.
Jean Davison: “Oswald couldn’t have made the specific plans to shoot JFK until after the motorcade route was announced on November 19, when the opportunity fell into his lap. He must have decided sometime between then and Thursday morning (21st) when he asked Frazier for a ride to Irving where his rifle was kept.”
Norman Mailer: “Oswald has come, by now [November 19], to a serious decision. It is still preliminary to his final determination, but he has decided to take his rifle to the School Book Depository on Friday, November 22. All week, the talk at work has been concerned with President Kennedy’s visit. The route has been published in the newspapers. The official motorcade will pass by the Texas School Book Depository on Elm Street. Our man, who has spent half his life reading books and now works in a place that ships out textbooks to the children and college youth of America, may be preparing to engage in an act that some huge majority of the people who read books devotedly would be ready to condemn.” (Oswald’s Tale p. 663) (H/T John)
Photon: “The day that he discovered that the JFK’s motorcade was going to go past the TSBD.”
Vincent Bugliosi: “…The mundane exercise of learning to drive and looking forward to one day having a driving license speaks loudly for the proposition that Oswald’s intent to murder the president was formed somewhat on the spur of the moment not long before the day of the assassination, and as a necessary corollary and concomitant to this, against the proposition that a group like the CIA or organized crime conspired with Oswald to have him kill Kennedy for them.”
“Other things Oswald did during the month leading up to the assassination clearly represented a person in the normal, humdrum rhythm of life, not someone preparing, with others, to murder the president of the United States.” (Reclaiming History, p.1445) (H/T Bill Kelly)