When is the time to trade forex ?

When is the time to trade forex ?
Forex can be traded 24 hours a day and 5 days a week. The main trading centers are in London, New York, Tokyo, and Singapore, but banks throughout the world participate. The biggest foreign exchange trading centre is London, followed by New York and Tokyo. Currency trading happens continuously throughout the day; as the Asian trading session ends, the European session begins, followed by the US session and then back to the Asian session, excluding weekends