{date} is the date the entry was (first) made in Calibre. You could change it, I prefer to leave it as is, as there are actions that adjust {id} , so I have an idea of the order added.
There are 3 standard 'date' type fields in Calibre: {date},{published} and {last_modified}
You can always add a custom column of 'date type' if you need it for another purpose
BTW You show the MDE of Calibre, not CC
|