I have an excel spreadsheet with a pivot table field, Date. On June 30th, the current fiscal year ends, and a new one begins on July 1st. I have the data grouped one column for seven days, going from 7/1/2019 to 6/30/2020. I have usually been able to enter the new data range, and the Date pivot table updates correctly. Image 01.jpg

I am trying to change to the new dates, 7/1/2020 to 6/30/2021.
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After I click ok above, it now creates a new pivot field, Days(Date) and messes up the file.
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Does anyone know why the new pivot field is being created, instead of just updating the Date pivot field, and how to correct this? Thanks.