Foreign exchange is traded in an over-the-counter market where brokers/dealers negotiate directly with one another, so there is no central exchange or clearing house. The biggest geographic trading center is the United Kingdom, primarily London. According to TheCityUK, it is estimated that London increased its share of global turnover in traditional transactions from 34.6% in April 2007 to 36.7% in April 2010. Owing to London's dominance in the market, a particular currency's quoted price is usually the London market price. For instance, when the International Monetary Fund calculates the value of its special drawing rights every day, they use the London market prices at noon that day.
So, yes, at any given trading center, it's an eight hour day. But that really doesn't matter, because somewhere in the world trading centers are open. You can trade anytime you want, although you should also note that you'll get the narrowest spreads -- the broker's profit margin -- when the maximum number of trading centers are open or, more precisely, when the trading volume for your currency trade is greatest. 
Basically, the Forex market is where banks, businesses, governments, investors and traders come to exchange and speculate on currencies. The Forex market is also referred to as the ‘Fx market’, ‘Currency market’, ‘Foreign exchange currency market’ or ‘Foreign currency market’, and it is the largest and most liquid market in the world with an average daily turnover of $3.98 trillion.
According to the 2018 Greenwich Associates study, Citigroup and JPMorgan Chase & Co. were the two biggest banks in the forex market, combining for more than 30 percent of the global market share. UBS, Deutsche Bank, and Goldman Sachs made up the remaining places in the top five. According to CLS, a settlement and processing group, the average daily trading volume in January 2018 was $1.805 trillion.
Signal ID: 64888 Time Issued: Friday, 12 April 2019 09:00:15 GMT Status: open Entry: 126.399 - 126.685 Limit: N/A Stop Loss: 127.115 The Congestion Opportunities Strategy has just sold EURJPY at 126.542. The system recommends entering this trade at any price between 126.399 and 126.685. The signal was issued because the 28-hour Relative Strength Index indicates...
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Both types of contracts are binding and are typically settled for cash for the exchange in question upon expiry, although contracts can also be bought and sold before they expire. The forwards and futures markets can offer protection against risk when trading currencies. Usually, big international corporations use these markets in order to hedge against future exchange rate fluctuations, but speculators take part in these markets as well.