Changing creation -- not change -- date of my NEF files

[ArthurFink]

Date was set wrong in my camera, so file creation dates are all in 2013.  When I run
exiftool "DateTimeOriginal+=2:0:0" *.NEF
the change date, and not the creation date, is being set to the right date in 2015.  But when I look at the NEF files on my Mac, it shows them to have been created or changed today.

How can I set just change the creation date year, and not affect the changed date at all?  Can I do it with exiftool?  Or do I need other software?

[Phil Harvey]

Read FAQ 24 for some help understanding the date/time tags.

There is a round-about way of setting the FileCreateDate on a Mac.  For details, see the notes for the FileCreateDate tag in the Extra tags documentation.

- Phil