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  1. or download this
    my $state = $hash{$date}++ ? 'exists' : "doesn't exist";
print qq(<TD class="table_font">$date - Hash $state</TD>\n);
  2. or download this
    if ($hash{$date}++) {
  print qq(<TD class="table_font">$date - Hash exists</TD>\n);
...
else {
  print qq(<TD class="table_font">$date - Hash doesn't exist</TD>\n);
}