Set file attributes on files in an HFS+ directory. More information: https://ss64.com/osx/setfile.html.
setfile -d "MM/DD/YYYY HH:MM:SS" path/to/file1 path/to/file2 ...
setfile -m "MM/DD/YYYY HH:MM:SS" path/to/file1 path/to/file2 ...
setfile -P -m "MM/DD/YYYY HH:MM:SS" path/to/file1 path/to/file2 ...