November 20, 2019 16:33:46
Please be advised that due to a Cboe Options Exchange ("C1") system issue, the month and date fields corresponding to FIX fields MaturityMonth and MaturityDay for FLEX trades have been transposed on OPRA administrative messages since October 7, 2019. A format of mm/dd/yyyy was expected by OPRA, but a format of dd/mm/yyyy has been supplied by C1. Outside of these FLEX trade administrative messages, there has been no impact to OPRA reporting.
This issue is scheduled to be resolved in production by a software patch effective Monday, November 25, 2019.
Please contact the Cboe Trade Desk with any questions.