Hello there, @JuliannaRamos ...
Thank you for providing that video. That was very helpful. And, because you shared that video, I learned something new (because I've never really used the screen that you were showing). So, I am assuming that when you click on your course "Settings" button, you are then clicking on the "Copy this Course" option on the right side of your screen. (As I was watching your video, I was trying to figure out why you had "Start Date" and "End Date" fields showing on your screen.) Whenever I need to copy course content from one course to another, I always use the "Import Course Content" option instead of "Copy this Course" option. The screens are similar, but the functions of both options are slightly different.
If you already have a blank course shell available to you, I would recommend logging in to that blank shell, and then follow the instructions in the second link to import content from another course into the blank shell. You should still be able to import and adjust the due dates for the new course shell. To be honest, I've never used the "Copy this Course" option, so I'm not sure why it would not keep those due dates for you. But, you might have better luck using the Course Import Tool option instead.
Keep us posted on this...hopefully you'll have better luck using this option instead. Good luck!
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