PhabricatorTime.php
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PhabricatorTime.php
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	<?php

	final class PhabricatorTime {

	private static $stack = array();
	private static $originalZone;

	public static function pushTime($epoch, $timezone) {
	if (empty(self::$stack)) {
	self::$originalZone = date_default_timezone_get();
	}

	$ok = date_default_timezone_set($timezone);
	if (!$ok) {
	throw new Exception("Invalid timezone '{$timezone}'!");
	}

	self::$stack[] = array(
	'epoch' => $epoch,
	'timezone' => $timezone,
	);

	return new PhabricatorTimeGuard(last_key(self::$stack));
	}

	public static function popTime($key) {
	if ($key !== last_key(self::$stack)) {
	throw new Exception("PhabricatorTime::popTime with bad key.");
	}
	array_pop(self::$stack);

	if (empty(self::$stack)) {
	date_default_timezone_set(self::$originalZone);
	} else {
	$frame = end(self::$stack);
	date_default_timezone_set($frame['timezone']);
	}
	}

	public static function getNow() {
	if (self::$stack) {
	$frame = end(self::$stack);
	return $frame['epoch'];
	}
	return time();
	}

	public static function parseLocalTime($time, PhabricatorUser $user) {
	$old_zone = date_default_timezone_get();

	date_default_timezone_set($user->getTimezoneIdentifier());
	$timestamp = (int)strtotime($time, PhabricatorTime::getNow());
	if ($timestamp <= 0) {
	$timestamp = null;
	}
	date_default_timezone_set($old_zone);

	return $timestamp;
	}

	}