In the Mac OS system, every file have two main time attribute: “Create Time” and " Modify Time", they can be check by clicking the file and select get info button.

Changing those two attributes by using setfile command.

1. setfile -d 'mm/dd/yy hh:mm:ss' filename can change the create date.
2. setfile -m 'mm/dd/yy hh:mm:ss' filename can change the modify date.

note: installing Xcode command line tools before using setfile command in terminal.