I want to change some of the past rollover date in NT's instrument manager, based on volume. For example, ZS's rollover date was 4/17 but the July contract's volume exceeded that of May contracts on 4/20. The offset in instrument manager is 11. If I change the date from 4/17 to 4/20, how can I calculate the correct offset and change it accordingly?
Thanks for your help,
Jack
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