Exchange Time, which ever timezone the exchange is located in. i.e. NYMEX = EST / CME = CSTI'll borrow this thread. When is the closing time considered for futures? I find different brokers having slight candle differences. So if you look at daily candles, when is the "end of day" considered? CST, EST,UTC? So when they say "overnight margin" or "closing your positions until the end of the day" what timezone are we talking about here?