since i like it dark in the morning but like to stay up late with my fish, my timers are set to run the tanks from 11am to 11pm.
I feel the timing of the lights is only important to the human occupants, and the fish will just have to 'get used' to whatever schedule you pick for them... provided a few basic requirements are met
1) provide a long enough 'day', 8 to 12 hours
2) provide a long enough 'night', at least as long as the day
3) once you pick the schedule, don't change it too often