I believe it's one hour before sunrise to two hours after sunset.
However, as I rarely fish much before sunrise (no matter how soon I get up in the AM it ALWAYS seems to be dawn when I actually get ON the water!) or much after full-dark which is about an hour after sunset, (it's a real adventure landing a salmon in the dark, head lamp or not, as reeling him in through the rod guides is a distinct possibility) so I don't actually worry about it.
(1/2 hour before sunrise to 1/2 hour after sunset is legal deer hunting hours! That, I am certain of!!!)
I don't have a current fishing book maybe somebody else on this site can verify the legal times, although I'm pretty certain that's right.