I dont know if there is really a "good" time of day for carp. Ive caught them everywhere from 4am to 11pm. You have to be patient with these fish as well. I will sometimes sit for 8 hours before I get a hit. Carp are one of the most trickiest fish to catch imo. Corn works just fine. I also make a homemade oatmeal bait that is killer. Be sure to use a sliding sinker if you are fishing on the bottom. Alot of times the carp will notice the weight of the setup right away, and spit it out. Also, wait until your pole gets SLAAAMED before you set the hook. If you are getting some decent looking hits, WAIT. Sometimes the pole will bounce pretty good for 10 or 15 seconds, and then WAM! Be sure to set your drag nice and loose, because when they take the bait and run, they go full steam. GOOD LUCK!!