An order qualifier (specifically, time in force, TIF) whereby an order that is set to expire during an auction call phase will not be expired until after uncrossing has completed. As such, a GTT order (good till time order) is eligible to participate in the same uncrossing. Traders may choose to not take part in a scheduled auction by setting the expiry time very close to the scheduled start time (e.g., at least 2 seconds prior to such time).

GTT orders set to expire during a closing price crossing session (CPX) will be expired at the set time. If not, a GTT order will be expired at the end of trading day.