use strict;
use File::Find;
use Fcntl;                          # to get 'em constants
use MLDBM qw(DB_File Storable);

our $dir = '/home/punkish/stuff';
our $db = '/home/punkish/data/files_by_dates.bdb';
our %o;

createDatesDb();

sub createDatesDb {

  # delete existing db, and create a new one
  unlink "$db"; tie %o, 'MLDBM', "$db", O_CREAT|O_RDWR, 0640 or die $!;
  
  find(\&_buildDatesDb, ("$dir") );
  
  untie %o;
}

sub _buildDatesDb {

    if (-f $_) {
    
      my @t = localtime( (stat("$_"))[9] );
      my $yyyy = $t[5] + 1900;
      my $mm  = sprintf("%02d", $t[4] + 1);
      my $dd  = sprintf("%02d", $t[3]);
      
      if (exists $o{$yyyy}) {
        if (exists $o{$yyyy}->{$mm}) {
        
          # year, month, and day exist, so push the file 
          # into the day's array
          if (exists $o{$yyyy}->{$mm}->{$dd}) {
            my $aref = $o{$yyyy}->{$mm}->{$dd};
            push(@$aref, $_);
          }
          
          # year exists, and month exists, but day doesn't yet exist,
          # so add it and all other info
          else {
            $o{$yyyy}{$mm}{$dd} = [$_];
          }
        }
        
        # year exists, but month doesn't yet exist,
        # so add it and all other info
        else {
          $o{$yyyy}{$mm} = {$dd => [$_]};
        }
      }
      
      # year doesn't yet exist, so add it and all other info
      else {
        $o{$yyyy} = {$mm => {$dd => [$_]}};
      }
    }
    
}