Best time ...?

I would suggest eat breakfast after doing cardio 1st thing in the morning. But do have a drink of water and keep re-hydrating your body during cardio exercise. That will force your body to burn more fat, since the glucose level in your system will be low, after fasting/sleeping for 8+ hours. But it is different for weight/strength training, you'll need the extra energy for lifting weights. A complex carbo (low glycemic) pre-workout snack will be a good idea. It'll release the energy slowly through out your training session. And will be great if you can have a low fat high protein snack right after training.
Hope this helps, good luck.

Whether you eat before you work out, or after, it won't affect how many calories you burn. Burning more calories on an empty stomach is a myth.

I would not suggest oatmeal before a work out, but it would be good for after. Something lighter, and easy to digest would be the best suggestion for before a work out (some yogurt, a glass of juice, or maybe toast with a bit of peanut butter, or jam), at least 20-30 minutes before you start exercise. And dont forget to stay hydrated. Good luck!

definitely don't eat right after a workout. if you eat before, you should give yourself like an hour and a half to digest.

you should eat breakfast first, before working out, because it gives you more energy to work out.

YA , YOU LOSE WEIGHT MORE IF U EXERCISE BE4 BF...... EAT YOUR BREAKFAST AFTER U TAKE THE SHOWER AFTER UR WORKOUT!.. MAKE SURE U DONT EXERCISE MORE THAN 30 MINUTES WITHOUT FOOD.. or u'll faint :-[