Up until March 10th, 2018 you can expect Happily Ever After to take place at 7:55pm each night. Until this change each showing of Happily Ever After was scheduled for 8pm.
— Ride Vine (@RideVine) May 13, 2017
Disney has not given a reason for the schedule change but times guides are being updated. Be sure to check out the My Disney Experience App for up to date park times and information.