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True Day Open and Midnight Open as Bias Filters

Some traders use the day's opening price as a simple dividing line between bullish and bearish conditions. It's easy to apply and surprisingly useful as a filter. The idea: if price trades above the open, buyers have controlled the day so far. If it trades below, sellers have. Many SMC traders use specific opening prices, such as the midnight New York open, as their reference.

How to use it:

1. Choose one opening price and stick with it. For example, the midnight open in New York time. Convert it to your own time zone once and write it down.
2. Mark it as a horizontal line on your chart each day.
3. If your bias is bullish, look for buys when price is below the open, in discount relative to the day's start.
4. If your bias is bearish, look for sells when price is above the open.
5. Treat price moving away from the open in the opposite direction first as a potential manipulation phase.

Example: bullish bias, price drops below the open during the London session, sweeps a low, then shifts structure upward. That's a classic setup using the open as a reference.

Limitations:

- It isn't a standalone signal
- Strong news can ignore it
- Different sources define the open differently

Use it as one piece of confluence, not as the whole plan.

The post uses the open in two ways that pull against each other, so it's worth being explicit. As a filter, "price above the open means buyers control the day." As an entry location, step 3 says buy below the open when bullish. Both can be true, but only if the filter is read later in the day: below the open during London is a discount for a bullish bias, and the bias is confirmed if price ends up holding above the open into New York. If you apply the filter at the moment of entry, it will tell you not to take the very trade step 3 describes.

For people in Central Europe, midnight New York is 06:00 on our clocks most of the year, so the line is already set before London starts, which is handy.

A simple way to test step 5: on days that closed up, count how often the London low printed below the midnight open. If it's most of them on your pair, the manipulation idea has something to it. If it's around half, the open is just another line.

The day's open is a simple filter that's easy to test. A quick study readers can do: for the last 100 days, note whether price was above or below the midnight New York open at the London open, and whether the day closed on the same side.

If the agreement is well above 50% for your pair, the filter has value. If it's near 50%, it's just a line. Testing it this way also shows whether the filter works better on some days of the week than others.

One practical trap with the midnight New York line is coming up shortly. The UK and Europe set clocks back on 25 October, but the US does not change until 1 November, so for that week midnight New York lands at 04:00 London instead of 05:00.

If the open is drawn by an indicator using broker server time, it can quietly shift by an hour that week, or fail to shift when it should. For a filter measured against an Asian session level, one hour is a lot of price.

For the 100 day study, I would add a neutral band. At the London open price is often only a few pips from a line set three hours earlier, so I count anything within 5 pips on EURUSD as no reading, rather than forcing it above or below.

That band also helps with the tension PropScalpDesk points out. A buy just under the open in London and a close above it later are both fine, but a buy 2 pips under the line is not really a discount at all.

How do you handle the March gap, when the US moves first? The same mismatch runs the other way for two or three weeks there.