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Thanks Cuegis and Djux. Good discussion. That helped clarify a few things for me as well. I have been doing more and more trades on my own now. The charts really help me make sensible decisions most of the time. Well worth the money.

I guess the downward drift, that I was looking at, seemed unusual to me,because, for the most part, I typically trade calendars as my pre earnings,delta neutral, approach, and,as you say, there is a period where it begins to rise. It is a different animal than a straddle. With calendars, the best approach, would be to trade the RV , pre earnings , range, by doing your best to buy RV at the low end, of previous ranges, and sell it near the higher end. Ideally doing it several times in a 2-3 week period. With straddles, you are using the gamma from the straddle, to trade the deltas that change , with any movement in the underlying. So, the way to secure profits is very different between the two.

Yes correct. Day 0 is the last trading session before the earning announcement. So if the announcement is after market close, then Day 0 is the same day. If the announcement is before market open, then Day 0 is the trading day before. For straddle, the RV is almost going down. Depending on the stock, it could be less or more steep, sometimes there are some zones where it's more flat/less steep. But in general the straddle RV go down. This is why Yowster added the short strangle hedge component to try to not lose too much if the stock doesn't move while keeping some possible gamma gains if the stock moves. For calendar, for some stocks it's a little bit different and there are some stocks where you see 2-3 weeks before earnings (typically after the earning date has been confirmed) the calendar RV going up. See the screenshot for the calendar RV below. You could zoom in on the website. You can see the earning date being confirmed around T-15, then then RV of the calendar goes up.