Manually change date added?

[selene1123]

Is there a way to manually change the Date Added? Or sort by Date Collected instead of Date Added?

I want to import my existing book library into Floppy, but that sets them all to the same Date Added. But for some filters/lists (such as my To Be Read shelf), it would be helpful to sort by oldest purchased, not necessarily oldest release date or date added., when that doesn't necessarily correspond to when I actually "collected" the book.