When we first moved to Canvas, I let Canvas adjust due dates when I performed a course copy, but I was always having to spend time cleaning it up and invariable missed something prompting my students to ask if I expected them to use a time machine! I now set the course copy process to remove all due dates, then just add the correct dates into the new section shell.
Because of the way Canvas is set up, this is tedious, and I like the suggestion @scottdennis brought over of using masters more like a template, and matching the numbers of modules to the weeks of the terms. However, we have too much variance at our school in both term lengths, and instructional unit (modules) structure - not everybody uses the weekly module model.
So, tedious or not, this is the best way I have found for my own workflow to make sure that the due dates for the new term are correct.
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