Hi Everyone, I'm posting this because i'm having a bit of confusion regarding contract periods. I saw that the last trading day for the 10 Year T Bills is September 19th. However, i was wondering when i can start trading the December Futures. Right now i have a simulator account with E-Trade as well as TOS. On TOS i can trade December but on E-Trade they only offer September right now. Can anyone explain how it works as far as when a contract period is ending and when you can trade the next period. I appreciate it.