When I print the contract details for a particular contract I do not get the field m_tradingHours that it is supposed to be there according to http://www.interactivebrokers.com/php/apiUsersGuide/apiguide.htm This is what I got: Code: conid = 30351181 symbol = GOOG secType = STK expiry = null strike = 0.0 right = null multiplier = null exchange = SMART primaryExch = NASDAQ currency = USD localSymbol = GOOG marketName = NMS tradingClass = NMS minTick = 0.01 price magnifier = 1 orderTypes = ACTIVETIM,ADJUST,ALERT,ALGO,ALLOC,AON,AVGCOST,BASKET,COND,CONDORDER,DARKPOLL,DAY,DEACT,DEACTDIS,DEACTEOD,DIS,GAT,GTC,GTD,GTT,HID,ICE,IOC,LIT,LMT,LOC,MIT,MKT,MOC,MTL,NONALGO,OCA,OPG,OPGREROUT,POSTONLY,PREOPGRTH,REL,RTH,SCALE,SCALERST,STP,STPLMT,SWEEP,TIMEPRIO,TRAIL,TRAILLIT,TRAILLMT,TRAILMIT,WHATIF, validExchanges = SMART,ARCA,BATS,BEX,BTRADE,CBSX,CHX,CSFBALGO,DRCTEDGE,EDGEA,IBSX,ISE,ISLAND,JEFFALGO,LAVA,MIBSX,NSX,TRACKECN,VWAP underConId = 0 longName = GOOGLE INC-CL A And as you can see there is no tradingHours field in this listing. Moreover, I just checked the ContractDetails.java source that is downloaded when installing TWS and I did not see any field called m_tradingHours. Any idea about why this incoherence? Thansk in advance