ManiphestExcelFormat.php
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			<?php

			abstract class ManiphestExcelFormat extends Phobject {

			final public static function loadAllFormats() {
			return id(new PhutilClassMapQuery())
			->setAncestorClass(__CLASS__)
			->setSortMethod('getOrder')
			->execute();
			}

			abstract public function getName();
			abstract public function getFileName();

			public function getOrder() {
			return 0;
			}

			protected function computeExcelDate($epoch) {
			$seconds_per_day = (60 * 60 * 24);
			$offset = ($seconds_per_day * 25569);

			return ($epoch + $offset) / $seconds_per_day;
			}

			/**
			* @phutil-external-symbol class PHPExcel
			*/
			abstract public function buildWorkbook(
			PHPExcel $workbook,
			array $tasks,
			array $handles,
			PhabricatorUser $user);

			}

phab/src/applications/maniphest/export/ManiphestExcelFormat.phpf695dcea9ee8stable