Quote:
Originally Posted by kensmosis
I also can directly modify the "modified" date by this approach regardless of its ro status in calibre.
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The 'modified' date in Calibre can be changed any time a change is made to metadata, so you do not want to rely on this not changing unexpectedly. The 'added' date is not subject to change so you could use that. You could also set up one or more user defined columns to store such information and these would not be touched by Calibre so that may be the more reliable way to do this sort of thing.