Warner Bros. has dated boxing comedy “Grudge Match” for Nov. 15.Project stars Robert De Niro and Sylvester Stallone as retired fighters who decide to step into the ring one last time to settle an old score. Peter Segal (“Get Smart”) is directing from a script by Tim Kelleher. Billy Gerber is producing with Michael Ewing and Mark Steven Johnson. Production began earlier this month in New Orleans. Alan Arkin has been signed to portray the trainer of Stallone’s character. Warner Bros. announced the dating on Wednesday, a day after Dreamworks said that Disney had set Nov. 15 for the release of its WikiLeaks drama “The Fifth Estate,” starring Benedict Cumberbatch as Julian Assange with Bill Condon directing. Universal’s has also dated its unititled sequel to 1999 comedy “The Best Man” for Nov. 15.