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Re:Git: Using Advanced Rebase Features for a Clean Repository by dmacedo on Wednesday August 09, 2017 @08:19AM (#14967815)
You're correct, it doesn't change the author date.

In order to do no.1; perform your rebase, and then change the dates with filter-branch. I have a couple of helper functions for both for resetting to commit or author dates [1], use at your own risk! :)

[1] https://gist.github.com/dm/aad8e34a5ee6b542a0bc788375b548ed

Re:Git: Using Advanced Rebase Features for a Clean Repository by EnderMB on Wednesday August 09, 2017 @09:29AM (#14968522)
Yep, it took me a while to figure out why my commit dates didn't match the dates within GitHub. Luckily, it's fairly straightforward to figure out once you know what the issue is!