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What is wrong with Quantopian Backtest?

My strategy start at 2015-01-05, but in the Transaction Details, I buy the "BABA" from 2015-01-06. Why I did not buy the "BABA" at 2015-01-05. My strategy start at 2015-01-05.

1 response

Because you're running in daily mode. In daily mode, the algorithm executes sometime overnight (Midnight GMT I thinkā€¦ my backtest buys tend to execute around 8pm EST in daily mode). If you run in minutely mode, it will execute right at market open on your starting day.