How to check if the market is closed in MT4

QuoteClient qc = new QuoteClient(500414730, "jjm4cjy", "mt4-demo.roboforex.com", 443);
ConSessions[] sessions = qc.GetSymbolInfo("EURUSD").Ex.sessions;

"sessions" in this case ConSessions[7] array for each day of week from Sunday,

Each array element contains information about quote and trade session, like open time and close time.