vix_utils
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Roll periods and weighting for continuous 30 day maturity can be out by a day
These should be minor, but pandas_market_calendars may indicate CBOE was open when it wasn't on the odd holiday, including June 19, 2023.
https://github.com/rsheftel/pandas_market_calendars/issues/261
I think thi sis no longer an issue since pandas_market_calendar is fixed.