If you need to exit at end of day with the highest execution chance and arguably the most liquid price, the best order type to use is MOC (Marketable On Close). These orders pile into the closing auction event that usually gets 5-15% of liquidity for the entire day, i.e. about an hour worth of regular trading packed into a single event.?Additionally MOC orders remove the hassle of tracking the exact time of market close which can be different on certain dates. This will save you a lot of efforts and troubles, which will very likely hit you if you are contemplating placing marketable orders into after-hours trading where poor liquidity can be destructive to any reasonably good trading strategy. Placing regular-hours orders a few minutes or seconds before market close is generally much safer but offers little to no benefits compared to a MOC order. But this all is rather an aspect of strategy than technology, so it's not directly relevant in this discussion group. For a MOC order, use OrderType = "MOC" and Tif = "DAY".
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Best,
DS
