PhabricatorCalendarHoliday.php
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	<?php

	final class PhabricatorCalendarHoliday extends PhabricatorCalendarDAO {

	protected $day;
	protected $name;

	public 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;
	}

	}