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Last Modified Date will change to 'Now' when you convert, but lots of other less obvious actions can also change that date, e.g. if you correct a typo in a tag all the books with the tag will have their Last Modified Date set to 'Now'.
Its easy to maintain a custom date, just create a custom date column e.g. mydate/My Date with the desired format e.g yyyy-MM-dd, and make sure its visible in the book list. When you want to set a book's My Date to 'Now', press F2 in the My Date cell -- if it's empty it will be set to 'Now' and you can press Enter, otherwise you can set it to 'Now' by pressing '=' and Enter, or clear it by pressing '-' and Enter. Or of course, you can enter a date.
BR
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