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use constant MTIME    =>    9;    # File modification time

...
  else {
    $Text .= " PDF is UP-TO-DATE        \"$BulletinPDF\"\n";
    }

if (-M "$BulletinSrc" < -M "$BulletinPDF") {
    $Text .= " PDF is stale             \"$BulletinPDF\"\n";
...
  else {
    $Text .= " PDF is UP-TO-DATE        \"$BulletinPDF\"\n";
    }

                  Start of program
  TDS             :
...
i.e., stat() returns a TDS (time date stamp)
      -M returns a length since the start of the program