The post shows a still image from the scene in Back to the Future II in which Doc and Marty set the DeLorean’s dials to a day some 25 years in the future. The image circulating on social media shows the date as June 27, 2012.
That might sound plausible, as long as you didn’t fall for the exact same hoax two years ago. Back then, Internet pranksters altered the date to read July 5, 2010.
UPDATE: Mystery solved! The original hoax, in 2010, was the work of the film website Total Film, which confessed to posting the altered image as a joke. This time around it seems the post first appeared on the Facebook page of the mobile checkout app Simply Tap, which is promoting a box set of Back to the Future DVDs.