No. The CME open is 6PM ET for the next calendar trading date. The trading continues until 4:15PM ET that calendar day until we get the trading halt for 15 minutes. Then that calendar trading day continues until 5PM ET. Then the market closes for that calendar day. At 6PM ET, we're on the next calendar trading day. 4:45 AM ET trade opened this morning, that closes at 4:45PM ET today, is a trade booked as a trade for calendar day Tuesday, July 23rd. If you open a trade RIGHT NOW, at 9:45PM ET, on Tuesday July 23rd, it will be booked as a trade initiated on calendar day Wednesday, July 24th.
In futures, there really is no "after hours". We use those terms only to compare to the main equity Wall street hours, and the terms are intertwined. To most peoples' detriment I think.