What year does Poriot Curtain take place?

What year does Poriot Curtain take place?
"Due to its early date of composition, Curtain takes no account of Poirot's later career. While details are only very occasionally anachronistic (such as the mentions of hanging, which had been abolished in Great Britain in 1965) they often have implications for the series as a whole that can only be dismissed by remembering that Christie probably intended the novel to be published earlier than it was; the fifth paragraph ("Wounded in the war that for me would always be the war--the war that was wiped out now by a second and more desperate war.") sets it within World War II."