Quote from IBs website:
"Time in Force for Orders
The time in force for an order defines the length of time over which an order will continue working before it is canceled. We support the following time in force options:
DAY - A Day order is canceled if it does not execute by the close of the trading day. Unless otherwise specified, every order is a Day order.
GTC - A Good-Til-Canceled order will continue to work within the system and in the marketplace until it executes or is canceled by the customer."
GTC orders are not only valid during the day, they do not automatically cancel at the end of the day. GTC stay in the book until either executed or canceled, with a few exceptions:
- GTC - A Good-Til-Canceled order will continue to work within the system and in the marketplace until it executes or is canceled. GTC orders will be automatically be canceled under the following conditions:
- If a corporate action on a security results in a stock split (forward or reverse), exchange for shares, or distribution of shares.
- If you do not log into your IB account for 90 days.
- At the end of the calendar quarter following the current quarter. For example, an order placed during the third quarter of 2011 will be canceled at the end of the first quarter of 2012. If the last day is a non-trading day, the cancellation will occur at the close of the final trading day of that quarter. For example, if the last day of the quarter is Sunday, the orders will be canceled on the preceding Friday.
- Orders that are modified will be assigned a new “Auto Expire” date consistent with the end of the calendar quarter following the current quarter.
- Orders submitted to IB that remain in force for more than one day will not be reduced for dividends. To allow adjustment to your order price on ex-dividend date, consider using a Good-Til-Date/Time (GTD) or Good-after-Time/Date (GAT) order type, or a combination of the two.