I believe that you will keep your historical data, but it would be reported under the old day of week data (week beginning Sunday). CMS archives based upon interval, day, week, month, when the archiving date is reached the data is archived and stored as a weekly record for X number of weeks dependant upon your storage interval. I would expect the the week the change is made would look funny like a 5 day week, but before and after that week you would be OK.
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