The Hangover III will be released in cinemas in the US for Memorial Day weekend on May 24, 2013.
Prequel 300: The Battle of Artemisia will also see a summer release on August 2, 2013.
Guillermo del Toro project Pacific Rim has also been pushed back from May 10 to July 12, 2013.
Mike Tyson recently signed up to return to the Hangover franchise as a fictionalised version of himself.
Bradley Cooper, Zach Galifianakis and Ed Helms will reportedly earn $15 million (£9.5m) each for their roles in the third instalment.
300: The Battle of Artemisia producer Mark Canton recently stated that the prequel's script is "epic".
> Guillermo del Toro: 'Pacific Rim will have finest monsters ever'
Watch the trailer for The Hangover Part II below: