The document states that BarOffset (default = 940 for daily bars, otherwise 0), meaning the default BarOffset for daily bars is 940. However, in my tests with BarPeriod = 1440 (i.e., daily bars), the printed BarOffset remains 0, regardless of whether the underlying historical data consists of minute bars or EOD daily bars.

Any idea?

The default BarOffset = 940 for daily bars (BarPeriod = 1440) is an internal setting that Zorro only applies automatically if the asset is identified as a Stock (Type 1) in your asset list.


Here are the most likely reasons why you are seeing 0:

Asset Type: Check your .csv asset list. If the Type column is set to 0 (Generic/Forex) or any other value besides 1, Zorro uses the universal default of 0 (alignment at 00:00). For US stocks, ensure the Type is set to 1.
Order of Execution: If you print BarOffset at the very beginning of the run function before calling asset(), it will still show the global default. The asset-specific offset is only loaded after the asset is selected.
Data Source: Even if your historical data consists of minute bars, Zorro won't change the BarOffset unless the asset type specifically triggers it.


Recommendation: While Zorro aims to set these defaults, it is best practice to define the alignment explicitly in your script to avoid confusion across different brokers or asset lists:

c
void run() {
BarPeriod = 1440;
BarOffset = 9*60 + 40; // 940: Align with US market close (15:40 ET)
...
}

Note that 940 is the standard offset for US stocks because the last 1-minute bar of the session starts at 15:59 and ends at 16:00. 940 minutes after midnight is 15:40, which matches the bar timestamping logic (timestamp = bar start time).