A day order is an instruction to buy or sell that is valid only for the current trading day. If it is not fully executed by the market close, any unfilled portion is cancelled automatically.
It is a common time in force setting. Traders use it to keep orders focused on today’s price action and to avoid carrying unintended exposure into the next session.
What counts as the end of the day?
On most stock exchanges, the trading day runs through a regular session with defined opening and closing times, often with pre-market and after-hours sessions around it. A day order usually expires at the end of the regular session, although some brokers let you choose whether it should also be active in pre or post-market trading. If you opt in, the order can remain live until the end of the extended session, then lapse.
Many venues run opening and closing auctions that set the official open and close. Depending on how your platform routes orders, a day order may be eligible to take part in those auctions. If it is active into the close and priced to trade, it can be matched in the auction that establishes the closing price.
In futures and some global markets, the “day” may span near 24 hours with a defined settlement or session break. A day order there expires at the designated session end for that contract. In crypto, which trades around the clock, some platforms still offer a day-style expiry that cuts off at a fixed time zone. The exact cut-off and eligibility for different sessions vary by venue and provider.
How day orders behave by order type
The day setting controls how long the order can rest, not how it tries to execute. That comes from the order type you choose:
- Limit order, day: Posts to the book at your limit price and stays there through the day. It may be partially filled as liquidity appears. Any remainder cancels at expiry.
- Market order, day: Executes immediately against available liquidity. Because market orders do not rest, the day qualifier only matters for related instructions like stops that have not yet triggered.
- Stop order, day: Sits as a trigger level during the day. If the stop is hit before expiry, it sends a market order to execute. If not triggered by the close, it cancels.
- Stop-limit, day: Works like a stop, but when triggered it submits a limit order that can rest until the day ends.
With limit and stop-limit orders, partial fills are common. For example, if you bid for 1,000 shares and only 600 trade during the session, the remaining 400 are cancelled at expiry. Priority in most order books is price, then time, so a day limit that you place early can gain queue priority for that session but will not carry that priority into tomorrow because it will not exist then.
Why choose a day order
Day orders suit traders who want their intentions restricted to current conditions. Typical reasons include:
- Avoiding overnight risk: Prices can gap on out-of-hours news. If your order lapses at the close, you do not wake up filled at a price that made sense yesterday but not today.
- Cleaner position management: Day traders often want a fresh slate each morning without hunting for stale, forgotten orders.
- Price discipline: A day limit lets you show interest at your level without committing beyond the session. If supply or demand does not meet you today, you can reassess tomorrow.
- Margin and cash control: Resting orders can reserve buying power or the shares you intend to sell. When a day order expires, those holds are released for the next session.
Day vs GTC, GTD, IOC and FOK
Day is one of several time in force choices. The differences are about longevity and urgency:
| Time in force | How long it lives | Typical use |
|---|---|---|
| Day | Until the session close, then any remainder cancels | Intraday trading, avoiding overnight exposure |
| GTC (good till cancelled) | Persists across days until you cancel or a broker-imposed limit | Patience at a level far from current price |
| GTD or GTT (good till date/time) | Active until a specified date or time | Orders tied to a known deadline or event |
| IOC (immediate or cancel) | Fill what you can immediately, cancel the rest | Urgent execution with partial fills allowed |
| FOK (fill or kill) | Fill the entire size immediately, or cancel | All-or-nothing urgency, often for larger blocks |
GTC and GTD persist across sessions, which can be helpful but may also leave orders active through news, dividends or earnings you did not plan for. Day keeps things tighter to the moment.
Venue and broker differences to check
Market structure and platform rules shape how day orders behave. Points to confirm with your broker or venue include:
- Session coverage: Does “day” mean regular hours only, or also pre and post-market if you allow it?
- Auction eligibility: Can day limits participate in the opening and closing auctions, and how are they priced for auction matching?
- Routing and venues: Are your day orders routed only to the primary exchange or also to alternative venues, and do any destinations treat time in force differently?
- Cut-off times and holiday schedules: Early closes and special sessions can change the effective expiry time.
- Good-till-cancelled limits: Some providers cap GTC life at a set number of days, which may change your choice between Day and GTC if you want persistence.
Practices differ by market and can change, so it is worth reviewing platform settings and the order ticket each time you trade.
A simple example
Imagine a share trading around 102. You prefer to buy at 100, so at 10:15 you place a day limit buy for 1,000 shares at 100. During the morning, sellers briefly hit 100 and you are filled on 300 shares as your order reaches the top of the queue. The price then rebounds and trades between 101 and 103 for the rest of the session.
Near the close, the market drifts back to 100.20, then the closing auction prints 100.15. Because your limit is 100, it is below the clearing price and your remaining 700 shares do not trade. At the official close, your unfilled balance is cancelled automatically. Your position shows 300 shares long from 100, and your buying power that was reserved for the other 700 is released. If you still want the shares tomorrow, you submit a fresh order when you see the new opening context.
The same logic applies to a stop order set for the day. If you place a day stop at 99.50 and price never trades at or through 99.50 during the session, the stop cancels at the close. If it triggers intraday, it sends an order to the market straight away.
That is the essence of a day order: it makes your trading intent time bound to the current session, which keeps execution aligned with the prices and liquidity you can actually see today.