The 2013 Le Mans 24 Hours has been put back a week to 22-23 June.
Race organiser the Automobile Club de l'Ouest had originally announced that next year's endurance classic would take place on 15-16 June.
The date change has been requested by the FIA.
An ACO statement said the move had been prompted "in order to harmonise the world calendar of motor racing events".
The Le Mans test day has also been pushed back and will now be held on 9 June.
Next year's Le Mans will once again be the flagship round of the FIA's new World Endurance Championship.