r: How to format many columns at once based on specific column names from “as.character” to “as.Date” and subsequently find the most recent date?

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走了就别回头了
走了就别回头了 2020-12-03 21:09

How to extract the highest / most recent date across multiple rows? This similar thread did not provide a solution

I have multiple MRI scans on the same patient. I wa

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