OPEN-SOURCE SCRIPT
Calendar Spread - Oldinvestor
Simply choose what two securities (symbols) you want to compare. The study will subtract Open, High, Low, and Close of second input from the first. You may also move the plot line wherever you choose. It may be necessary to move the plot line in order for some charts to look right.
Open-source script
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in publication is governed by House rules. You can favorite it to use it on a chart.
Disclaimer
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