After a lot of research I have found out that the IB intraday futures margin for the EUR, GBP, JPY is from 14.20 to 20.45 CST. Could anyone please tell me in CST what the IB Intraday Futures Margin hours for ES and YM are? I am positive the margin call is at 15.00 CST, so that is also the end of the intraday period. I have no idea about the beginning of it, because when it happens I am at work. Besides I have been searching for months on the IB web site and I could not find such information.