What is the time-in-force and trading sessions

1.Time-in-Force

When placing an order, you can specify how long it remains active in the market. This is known as "time-in-force." The time-in-force options include: Day, Good-Till-Cancelled (GTC), and Good-Till-Date (GTD).

1.1 Day

A day order expires at the end of the trading day if not filled.

1.2 Good-Till-Cancelled (GTC)

A GTC order remains active until fully filled or manually cancelled. It expires automatically after 90 calendar days if not filled or cancelled before then.
 

2.Trading Sessions

Trading sessions are specific time periods during which the market is open for matching orders.
When placing an order, there are four session options: Regular Trading Hours (RTH), RTH+Pre/Post-Mkt, Overnight Trading, and 24 Hour Trading.

2.1 Regular Trading Hours

Orders will only be matched during the RTH.

2.2 RTH+Pre/Post-Mkt

Orders will be matched during the pre-market, RTH, and post-market sessions. Unfilled orders from pre-market automatically transfer to RTH, and unfilled RTH orders transfer to post-market.
Time-In-Force Trading Session Order Validity
Day RTH+Pre/Post-Mkt Until post-market ends
Day RTH Until market closes
GTC RTH+Pre/Post-Mkt Until filled or cancelled
GTC RTH Until filled or cancelled