Determines how long an order remains active in the market.
1. Day Order (Default)
1.1 Valid for the current trading day only; automatically cancelled if not filled by market close
2. GTC / GTD (Not Currently Supported)
2.1 GTC (Good-Till-Cancelled) and GTD (Good-Till-Date) orders are not currently supported for Korean stocks. All unfilled orders are automatically cancelled at market close.
Only Day Orders are supported. All unfilled orders expire at the end of each trading session.