Change Date and Time of Creation and Modification of file based on filename in MacOS folder

Question

I have a lot of files in folder with filenames like

20190618_213557.mp4
20190620_231105.mp4
20190623_101654.mp4
..

I need to change creati

Answer 1

I had the same problems trying to set the date from filename, and struggled a lot with the code suggested here.

Have to be careful to use the same variable letter for the loop and in the brackets! for i in... {x:4:2} should be for i in... {i:4:2} at least on mac and finish with a semicolon before done. This code should work:

for i in *.mp4; do
   SetFile -d "${i:4:2}/${i:6:2}/${i:0:4} ${i:9:2}:${i:11:2}:${i:13:2}" "$i";
done