testing

PhabricatorCalendarHoliday.php
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			<?php

			final class PhabricatorCalendarHoliday extends PhabricatorCalendarDAO {

			protected $day;
			protected $name;

			protected function getConfiguration() {
			return array(
			self::CONFIG_TIMESTAMPS => false,
			self::CONFIG_COLUMN_SCHEMA => array(
			'day' => 'date',
			'name' => 'text64',
			),
			self::CONFIG_KEY_SCHEMA => array(
			'day' => array(
			'columns' => array('day'),
			'unique' => true,
			),
			),
			) + parent::getConfiguration();
			}

			public static function getNthBusinessDay($epoch, $n) {
			// Sadly, there are not many holidays. So we can load all of them.
			$holidays = id(new PhabricatorCalendarHoliday())->loadAll();
			$holidays = mpull($holidays, null, 'getDay');
			$interval = ($n > 0 ? 1 : -1) * 24 * 60 * 60;

			$return = $epoch;
			for ($i = abs($n); $i > 0; ) {
			$return += $interval;
			$weekday = date('w', $return);
			if ($weekday != 0 && $weekday != 6 && // Sunday and Saturday
			!isset($holidays[date('Y-m-d', $return)])) {
			$i--;
			}
			}
			return $return;
			}

			}