Using Exiftool to shift datetime

1. Download the command line tool: exiftool
    ( http://www.sno.phy.queensu.ca/~phil/exiftool/ )
2.  Change all datetime tags in exif to add 1 year 2 month 3 day 4 hour 5 min 6 sec, and also overwite the original file
    >> exif tool "-AllDates+=1:2:3 4:5:6" -overwrite_original DIR_PATH
3. Finish