Since this is the Surf Fishing part of the forum, I'll assume we're talking from the beach in the surf.
In order of my personal preferances;
1st - 11:00 pm to 2:00 am
2nd - 1:00 am to 5:00 am
3rd - 2 hrs. before sunrise to about an hour after
4th - sunset
5th - daytime
A lot of this has to do with the enviroment too. Like fishing the beach on a Sunday during the day in the summer is next to rediculouse with the swimmers and all, plus googans, boaters, etc. enter into the equasion.
That's very general. tide, wind, moon phase, presure systems and of course the where has a awful lot of influence. And of course, none of this is cast in stone.