Quote:
Originally Posted by KenMatsu
Published date
I have several books that have a known year, but month is unknown and vice versa.
At the moment I write the known data and add unk_month or unk_year accordingly.
In my opinion, there should be blank values available for month and date.
I've been using this great program for three months now! I don't have any portable devices, but finally I have a program that organizes my books in Linux

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"Unknown Month", ("Unknown_day",) "Unknown_Year" are not Valid Date types
Note that Calibre can perform 'date arithmetic' searches on date (field type) values
1/1/101 (localized) is a assigned as a 'Unknown Date' marker.