Calendar longer term position selection

[T Lin]

Hello,

I'm trying to build a calendar back testing. The strategy is simple.

-- Every Thursday when VIX is low, buy:

  1) ATM

   2) Expiration date for short: 15 to 20 days

   3) Expiration date for long: 3 to 5 days away from short.

But when I run the test, it buys a calendar that long-short expiration days are not 3 - 5 days. (See attachment) How can I define the longer term position to be 3 -5 days away from short one?

Here is the link to strategy:

https://think.optionstack.net/zs/3/k-0PpaA+2M%2Fc+tdt9RLLdxLZhxH+iD3khLPvaCE05j%2FmafPG3TCD83fENIF15HSk3U

[OptionStack]

Can you try removing the "Leg" option for the daysBetweenOptions method?  The daysBetweenOptions method should be applied to the entire strategy, rather than a specific leg in the strategy.  

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[T Lin]

Thank you for your help!