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PhabricatorEpochExportField.php
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			<?php

			final class PhabricatorEpochExportField
			extends PhabricatorExportField {

			private $zone;

			public function getTextValue($value) {
			if ($value === null) {
			return '';
			}

			if (!isset($this->zone)) {
			$this->zone = new DateTimeZone('UTC');
			}

			try {
			$date = new DateTime('@'.$value);
			} catch (Exception $ex) {
			return null;
			}

			$date->setTimezone($this->zone);
			return $date->format('c');
			}

			public function getNaturalValue($value) {
			if ($value === null) {
			return $value;
			}

			return (int)$value;
			}

			public function getPHPExcelValue($value) {
			$epoch = $this->getNaturalValue($value);

			if ($epoch === null) {
			return null;
			}

			$seconds_per_day = phutil_units('1 day in seconds');
			$offset = ($seconds_per_day * 25569);

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

			/**
			* @phutil-external-symbol class PHPExcel_Style_NumberFormat
			*/
			public function formatPHPExcelCell($cell, $style) {
			$code = PHPExcel_Style_NumberFormat::FORMAT_DATE_YYYYMMDD2;

			$style
			->getNumberFormat()
			->setFormatCode($code);
			}

			}