Not good with cookie times? This will do it all for you.

Use as so: $tomorrow = time() + plusDays(1);
or $next_week = time() + plusDays(7);

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function plusDays($days)
{
	$number = 60*60;
	$times  = 24;
	for ( $i = 1; $i < $days; $i++)
	{
		$times *= $i;
	}
	return $number * $times;
}