How can I change the date format in a Sheet Summary?

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All of the dates in my sheets are formatted to YYYY-MM-DD, as that's a format that works well across our international teams. However, in my Sheet Summary, when I have it pull the date (=cell), it formats it as MM/DD/YY. That formatting then feeds into my report, and I can't seem to change it there, either.

How can I change the formatting of the date in the Sheet Summary so that it matches the rest of our standardized date formatting?

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