You may trade beginning when the exchange trading opens for your particular asset. Generally this is 5pm CT but may differ based on holiday or asset.
All positions and working orders must be closed by 3:10pm CT until 5pm CT.
HE/LE must be closed by 1:05pm CT until 5pm CT.
ZC/ZW/ZS/ZM/ZL must be closed between 7:45am-8:30am CT and then again between 1:20pm-5pm CT.
Trading can be conducted throughout the day except over the release of major economic events, public holidays and any times when the exchanges are closed. All relevant positions and working orders must be closed one minute before the release of major economic events and cannot be opened until one minute after the release. Please see below for the list of positions and working orders that are affected. You can also find more details on the specific events, times and assets here.
Please note that no other calendar, database or other list of events apply. Please only refer to the one linked above and make sure you check that at the start of the day.