Locate newer books in library than on a device
Is there a way of determining what books are newer in the calibre library than what is on a device, either directly within Calibre or via a plugin? For example, I'd like to know if I've editted an epub in Calibre more recently than when that epub was sent to the device. Even something as basic as "last mod time of library format is newer than last mod time of device format".
I tried searching for a similar question but couldn't find it asked. Also I hope Calibre->Devices is the right (sub)forum.
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