Rick, to change the date of a file, use touch.
There are two formats you can specify the date in.
The first is touch [mmddhhmm[yy]] file(s)
For example, touch  04221234      .profile
          or touch  0422123497    .profile

The second is touch -t [[[CC]YY]MMDDhhmm[.SS]] file(s)
 For example, touch -t          04221234    .profile
           or touch -t        9704221234    .profile
           or touch -t      199704221234    .profile
           or touch -t      199704221234.56 .profile

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The AIX ls -l command returns e.g.  Jul 25 2003  if the file
is older than 180 days-1 hour, else Jul 25 20:20
This example file changed at January 21, 2004 at 19:20:01.