The database might just have a last accessed date. Maybe a purchased date for ebooks direct from Kobo.
Ancient discussion here:
https://www.mobileread.com/forums/sh...d.php?t=295768
I suspect there is no general "reading start date" or Kobo Utilities in Calibre would have it. You can have a custom Calibre column updated with Reading Progress, so if connecting to Calibre regularly it's theoretically possible to have a custom column that has it's date set the first time the reading progress changes from zero.
I do see publication dates for some sideloaded ebooks on the Kobo. But that's no use to you anyway.
Quote:
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… the Kobo Utilities already has the function. It can set the timestamps used by the "Date Added" sort. The metadata update lets you choose one of the dates in calibre.
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So you can currently set the date added of any sideloaded book. I suspect other than that the only date is "last read". Activity doesn't seem to work well and may only be keeping running stats for the book you are reading?