protected static function digitCheck($y)
	{
		if ($y < 100){
			$yr = (integer) date("Y");
			$century = (integer) ($yr /100);

			if ($yr%100 > 50) {
				$c1 = $century + 1;
				$c0 = $century;
			} else {
				$c1 = $century;
				$c0 = $century - 1;
			}
			$c1 *= 100;
			// if 2-digit year is less than 30 years in future, set it to this century
			// otherwise if more than 30 years in future, then we set 2-digit year to the prev century.
			if (($y + $c1) < $yr+30) $y = $y + $c1;
			else $y = $y + $c0*100;
		}
		return $y;
	}