Hi QC team,

I came across LEAN and started playing around with custom data on file system. First of all, thanks for making it open source!

I was checking factor file for AAPL provided as sample data with LEAN and noticed that the dividend ratios and split ratio dates are pushed up by one trading day. So while preparing my data for LEAN to pick up, do I need to do the same? I understand it's a very basic question  given that it is evident from sample factor files but I am looking for intuition behind it. Would appreciate your response.