Preserving Date Modified on Nexus device (no root needed)

- From Android to PC: Use MTP
- From PC to Android: Use Droid Explorer

It preserves Date Modified.
I don't know how Droid Explorer does it.
But it just works.

Make sure USB debugging is checked before using Droid Explorer.

There's one limitation though.
Droid Explorer only can transfer files, not folders.

- With Droid Explorer, copy files into an Android phone on some specific folder
- Then with the file manager inside Android, move those files into the folder we want. Do not use copy because copying will alter the date modified while cut doesn't.