The forex market is available for trading 24 hours a day, five and one-half days per week. The Forex Market Time Converter displays "Open" or "Closed" in the Status column to indicate the current state of each global Market Center. However, just because you can trade the market any time of the day or night doesn't necessarily mean that you should. Most successful day traders understand that more trades are successful if conducted when market activity is high and that it is best to avoid times when trading is light.
The foreign exchange market may be left unregulated by governments, with EXCHANGE RATES between currencies being determined by the free interplay of the forces of demand and supply (see FLOATING EXCHANGE RATE SYSTEM), or they may be subjected to support buying and selling by countries' central banks in order to fix them at particular rates (see FIXED EXCHANGE RATE SYSTEM).