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PhabricatorCountdownEpochTransaction.php
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			<?php

			final class PhabricatorCountdownEpochTransaction
			extends PhabricatorCountdownTransactionType {

			const TRANSACTIONTYPE = 'countdown:epoch';

			public function generateOldValue($object) {
			return (int)$object->getEpoch();
			}

			public function generateNewValue($object, $value) {
			return $value->newPhutilDateTime()
			->newAbsoluteDateTime()
			->getEpoch();
			}

			public function applyInternalEffects($object, $value) {
			$object->setEpoch($value);
			}

			public function getTitle() {
			return pht(
			'%s updated the countdown end from %s to %s.',
			$this->renderAuthor(),
			$this->renderOldDate(),
			$this->renderNewDate());
			}

			public function getTitleForFeed() {
			return pht(
			'%s updated the countdown end for %s from %s to %s.',
			$this->renderAuthor(),
			$this->renderObject(),
			$this->renderOldDate(),
			$this->renderNewDate());
			}

			public function validateTransactions($object, array $xactions) {
			$errors = array();

			if (!$object->getEpoch() && !$xactions) {
			$errors[] = $this->newRequiredError(
			pht('You must give the countdown an end date.'));
			return $errors;
			}

			foreach ($xactions as $xaction) {
			$value = $xaction->getNewValue();
			if (!$value->isValid()) {
			$errors[] = $this->newInvalidError(
			pht('You must give the countdown an end date.'));
			}
			}

			return $errors;
			}
			}