Question: When did they start production on the post?

context: In October 2016, Amy Pascal won a bid for the rights to the screenplay "The Post", written by Liz Hannah. In February 2017, Steven Spielberg had halted pre-production on "The Kidnapping of Edgardo Mortara" after a casting setback, and consequently opened his schedule to other potential films to direct. The following month, it was announced that Spielberg was in negotiations to direct and produce the film, with Meryl Streep and Tom Hanks in talks for the roles of Katharine Graham and Ben Bradlee, respectively. "The Post" is the first time that Spielberg, Streep, and Hanks had all worked together on a film.
question: When did they start production on the post after screenplay rights were decided?
short_answers: October 2016
context: The film began principal photography in New York on May 30, 2017. On June 6, 2017, it was announced that the project, retitled "The Papers", would also star Alison Brie, Carrie Coon, David Cross, Bruce Greenwood, Tracy Letts, Bob Odenkirk, Sarah Paulson, Jesse Plemons, Matthew Rhys, Michael Stuhlbarg, Bradley Whitford, and Zach Woods. On August 25, 2017, the film's title reverted to "The Post". Spielberg finished the final cut of the film on November 6, 2017, with the final sound mix also completed along with the musical score a week later, on November 13.
question: When did they start production on the post with principal photography?
short_answers: May 30, 2017

Answer: The Post is a 2017 American historical political thriller film. In October 2016, Amy Pascal won a bid for the rights to the screenplay The Post, written by Liz Hannah. The film began principal photography in New York on May 30, 2017. The final cut of the film was finished on November 6, 2017 with the final sound mix being completed on November 13.