The Date added field always puts in a date when I add a book and it has always been todays date AFAIK. Pretty sure of this as I will add a bunch of books at once and I use the date field to sort by when I want to edit metadata. I didn't think date added was a standard metadata field. The last time I added a lot of books they all had opf files as I was merging libraries and still the date added was the date I added them not what was in the book or the opf file. Published is a different matter.
Either way you should be able to sort on your custom date column or type #custom column name:false in the search bar and use bulk edit to put in the date.
Helen
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