Folks, this is already fixed and in calibre source as of 21/4. When editing on the booklist the change to tooltips in 5.16.1 not to show the year 101 for "undefined dates" caused dates to internally appear as null (None). It happened on all dates except timestamp (timestamp can't be empty).
Last edited by chaley; 04-24-2021 at 04:12 AM.
Reason: Correct the reason for the bug
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