According to an Autosport report, the Automobile Club de l'Ouest had announced the dates for the 2013 race as June 15-16, but following a request by the FIA, the dates had been changed. The race will now take place the 22nd and 23rd of June. The test date for the race will now be on June 9th.
In a statement from the ACO, the change was made, "in order to harmonize the world calendar of motor racing events."
The schedule change will not alter the fact that the 24 Hours of Le Mans remains as the centerpiece of the FIA World Endurance Championship season. The current season includes 12 Hours of Sebring, and six hour races at Spa, Silverstone, Sao Paulo, Bahrain, Fuji, and Shangai.