gistfile1.php

protected static $tax_cache = array();

	public function get_tax($start,$end)
	{
		if (!isset(self::$tax_cache[$start->get_timestamp()][$end->get_timestamp()])) {
			// This should account for multiple users, kitchen->tax_interval and temporal edits

			$days = \Date::range_to_array($start, $end, "+1 day");
			$tax_days = 0;
			foreach($days as $d) {
				if (((int)$d->format('%d')) == $this->kitchen->report_day)
					$tax_days++;
			}
			self::$tax_cache[$start->get_timestamp()][$end->get_timestamp()] = $tax_days;
		}
		return $this->kitchen->tax * self::$tax_cache[$start->get_timestamp()][$end->get_timestamp()] * $this->tax_payers * -1;
	}