I suggest you DON't re-purpose the Date column. That reflects the date the original entry was made.
I prefer a Date TYPE custom column for my READ status (blank is not read, 2000 is my abandoned flag . 2014 dates are mostly for Empty books that document my paper library (It took a few weeks to scan their barcodes or type names when they were pre-ISBN )
Custom columns are easy to add. Right click on any column title: Add you own...
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