Given a period of time (e.g. a day, a week, a month), is it possible to list all files that were modified or added in this time?
I'd use diff to yield the file list directly, e.g:
git diff --name-only "@{3 days ago}" "@{2 days ago}"
changelog.txt
newfile.txt
In case you're curious which file got modified or added, use --name-status instead:
git diff --name-status "@{3 days ago}" "@{2 days ago}"
M changelog.txt
A newfile.txt