The midnight candle: why the daily open looks different on every platform

[Shadow Trader]

The daily candle open is not universal. Some brokers start the day at midnight server time, others at 5pm New York, others at midnight GMT. That means the daily open, high, low, and close differ from platform to platform.

For scalpers who use the daily open as a reference level, this matters. A rule like buy above the daily open means something different depending on where the day starts. The same applies to previous day highs and lows, which are popular levels in many strategies.

Even more confusing, weekend candles can show up on some platforms and not on others, depending on how the broker handles Sunday trading.

The best practice is to pick one convention and stick to it. Many traders prefer the 5pm New York close, because it matches how the FX market naturally rolls over. Some indicators allow setting the day start manually.

Some indicators allow specifying the session start time directly, which removes the dependence on the broker's convention. For automated systems, calculating the daily levels from raw hourly data using a fixed time zone gives consistent results across platforms and avoids unwelcome differences when moving from one broker to another.

Which daily open convention do you use, and has the choice ever changed a level that mattered?