In forex there is no "normal" market time. It’s a 24 hour market, however when people talk about market time they usually mean 9 to 17 local time.
If you live in UK The European market will open an hour earlier at 8 GMT (which would be 9 in Frankfurt).
The Asian market hours will be from England00:00 GMT to 08:00 GMT (9-17 >Tokyo).
European, from 8:00 or 9:00 until 17:00 (Frankfurtlace or lac London)
The American market is 14:00 GMT to 22:00 GMT (NY)
Most traders will agree that during "market hours" the price movements will be stronger coz there will be much more trading going on. The European and American hours lap during 14-17 GMT so you can look at that as well.
Another thing you might want to consider are the pairs you trade during different market hours – for example the Yen volume will be higher during Asian ours than out of those hours. The GBP will swap more hands during London hours than out of London hours etc
The news reports can be trouble for some and a feast for others. I really don’t think any one can advice you if to trade during news releases or not. It depends on the strategy your using and mainly if it works or not.
The only advice I can give you is to find a news calendar going back in time (google "news calendar") and check to see what would happen if you went by your trading rules during news releases, if you traded only during this or that market times.
Hope that helps and good luck with your trading!