PhabricatorCalendarHoliday.php
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PhabricatorCalendarHoliday.php
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			<?php

			/*
			* Copyright 2012 Facebook, Inc.
			*
			* Licensed under the Apache License, Version 2.0 (the "License");
			* you may not use this file except in compliance with the License.
			* You may obtain a copy of the License at
			*
			* http://www.apache.org/licenses/LICENSE-2.0
			*
			* Unless required by applicable law or agreed to in writing, software
			* distributed under the License is distributed on an "AS IS" BASIS,
			* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
			* See the License for the specific language governing permissions and
			* limitations under the License.
			*/

			final class PhabricatorCalendarHoliday extends PhabricatorCalendarDAO {

			protected $day;
			protected $name;

			public function getConfiguration() {
			return array(
			self::CONFIG_TIMESTAMPS => false,
			) + 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;
			}

			}