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You could add a rectangle of white over the unwanted area before adding your new text:
$gfx->strokecolor('white');
$gfx->fillcolor('white');
$gfx->linewidth(0);
$gfx->rectxy(161, 84, 161+(72*18/10), 84+7);
# above assumes longest previous date is 18 chars at 10cpi
$gfx->fillstroke();
I would also recommend adding the new date in the ISO8601 format to avoid confusion, particularly if the documents will have readers throughout the world.
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