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Orders sent during the broker's daily break

Most FX brokers have a short break around the daily rollover, usually a few minutes either side of 5pm New York time. During that window the platform may stop accepting new orders, or may accept them but not execute until quotes resume.

The exact behaviour depends on the broker and platform, so check how yours handles it.

Some brokers reject market orders sent during the break with an error like market closed. Some queue pending orders and process them once trading resumes. Some allow you to modify existing orders but not open new ones. Some keep quoting but with very wide spreads and no real liquidity behind the price.

For manual traders this rarely matters, because there's no good reason to trade right at rollover. For EAs it matters a lot. An EA that tries to open or close a trade at 23:59 server time can hit the break and fail silently, or keep retrying until the break ends and then fill at a poor price as spreads are still wide.

Pending orders are another issue. A limit or stop sitting near the market can trigger in the first seconds after the break, when spreads are often at their widest of the day. A buy stop just above the price can fill on the first wide ask even though the bid never moved.

The safest approach is to check the broker's trading hours for each symbol, note the break times, and either avoid having pending orders near the market around then or make sure your EA knows not to send anything during that window.

Indices and metals often have longer breaks than FX. Gold on many brokers stops for an hour at the daily close, and some index CFDs have breaks in the middle of the session too. If you trade gold alongside FX pairs, the break times aren't the same, and an EA that handles FX rollover correctly can still trip over a gold break. The symbol specification window in MT4 or MT5 shows the session times for each symbol, and those are the times your code should check, not a single general rule for the whole account. Futures based CFDs also have contract rollovers, which can shift prices and spreads on a specific date each month or quarter.

Daylight saving changes move the break on your chart. If your broker uses New York close for the server time, the break stays at the same server time all year, but it moves relative to your local clock when either region changes its clocks. Traders who set their routines by local time sometimes find their pending orders sitting at rollover for a week or two each spring and autumn without realising it. A quick check of the server time against your local clock in those weeks avoids the surprise. Brokers on GMT server time have the opposite problem, with the break moving on the server clock instead.

Holidays add extra breaks. On days like Christmas or New Year many brokers close early or run shortened sessions, and the break can be much longer than usual. Brokers normally send a notice with the schedule. Saving those notices in a folder, or copying the times into your desk note for the week, helps you avoid leaving orders sitting through an unexpected closure, especially if you're not watching the charts on those days anyway. Shortened sessions often come with wider spreads in the last hour before the early close as well. Pending orders left over a long holiday break also face the reopening, which can behave a lot like a Sunday gap.

The daily break around 17:00 New York trips up EAs regularly. A practical rule: have the EA stop sending new orders for ten minutes either side of the rollover, and log any rejections it gets during that time. Spreads are also widest around this period, so even if orders do execute, they often fill at poor prices. For manual traders in London this is late evening, at 22:00 London in winter, and unlikely to matter, but for anyone running automated strategies overnight it is worth checking.

A useful step for any EA is to log the error codes returned on order sends with a timestamp. After a few weeks you'll see whether any failures cluster around the daily break, and you can add a simple time filter to stop the EA from trying to trade then. That's easier than trying to guess the broker's exact behaviour from documentation, which is often vague about what happens to orders in that window. The log shows the real behaviour on your account. Once you know the pattern, the filter is usually a single check of the server time against a start and end minute.