[KevinH]

Unfortunately not. The actual epub is opened into a temp area (with all files copied in) and Sigil processes it from there. Saving a file or save-as takes those files and recreates the epub. It does not replace members in the existing epub it only overwrites the epub file. So file modification dates in the epub/zip are meaningless.

To track changes you will either need to use Sigil's checkpoints and in its diff capability, or git or possibly effectively do what github does and hash/checksum each file to see which are changed in the zip from a prior version to know what changed outside of Sigil.



Checkpoints would probably be easiest, but if your work process goes outside Sigil, then git or a python script to compare two versions of an epub using checksums would be helpful.