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     # compare ordered date strings
     my $result = sprintf("%04d%02d%02d",@date_1[2,0,1])
                  <=>
...
     # $result is -1, 0 or 1, so amend for output
     # to return only 0 or 1;
     return ($result + $result**2)/2;

# compare ordered date strings
return sprintf("%04d%02d%02d",@date_1[2,0,1])
       >
       sprintf("%04d%02d%02d",@date_2[2,0,1]);