I do not know if this is the correct place to post this but here it goes.

I have just realized after looking at the trades after running a backtest that is in a scale of weekly that all trades seem to be executed on Fridays. In reality, if a security meets the criteria for purchase on A friday, it will be purchased at the open or a specified price or better on the following Monday. This discovery leads me to believe that all of my backtests are invalid.

I have searched the forum but have not been able to find a solution. After thinking about the problem, I think that if I run the strategy in a daily scale but do my processing on the last trading day of the week, my trades will be executed on the first trading day of the following week. But, I do not know how to determine the last bar of the trading week.

I do not know if this whole issue is a non problem but it has me bothered that I can not find an explanation or a solution. Please help me either find a solution in the forum by pointing me to the correct place or by explaining how I might overcome this problem.

Thanks

Rick

The weekly bar completes on Friday. If your system triggers an AtClose[bar] order, it will be executed this Friday. If the order was AtLimit/Stop/Market[bar+1], it will be executed on the next bar: Monday on the open (AtMarket) or any day during the next week for AtStop/Limit.

However, since with Weekly data it's not (easily) possible to determine the actual order execution date, in the Entry Date column the next Friday's date is printed. I think this is what has confused you: the next Weekly bar's close date in the Entry Date column. This does not mean that your order was executed on the next Friday. This is a non-issue.

Maybe it would be more helpful for you to discuss a specific example. Create a small script, post it, pick a symbol and scale, and describe what you see... then we'll be able to tell you precisely why it should be that way.

Thank you for those answers. As long as my Buy/Sell at Market/Limit are actually executed on Monday, then you are correct - this is a non issue.

Right. The Limit/Stop order execution date may fall on any day of the week; Monday is for AtMarket only.