Edit the date for Android .mp4 videos?

[MxW]

Hi there,

I've been using exiftool to correct the dates on some of my pictures while I'm transferring them from my iPhone 5S to my new Samsung Galaxy S8. The picture dates are preserved when copied over to Android (the S8), but .mp4 videos get their dates reset to whenever I copy them. However, I discovered that if I take a video on the S8, copy it to my PC, delete it from the phone, and then copy it back, the date is preserved. I've set all the date fields that I can see with exiftool, but the fact that videos taken on the phone have their date information preserved is making me think that there's some sort of date field that exiftool isn't picking up.

I'd be more than happy to provide video taken from the phone if someone wants to examine it, as well as any other info that would help.
Thanks!

[Phil Harvey]

If you're just copying the files and the dates are changing then we're talking about filesystem dates, not metadata within the files.  Because just copying shouldn't change data in the file itself.

If you are on Windows, ExifTool can write FileModifyDate and FileCreateDate, which are both stored in the filesystem.

- Phil