public static function getTimeZoneId($userId = null, $date = null)
{
$dateKey = $date === null ? 0 : $date;
$userIdKey = $userId === null ? 0 : $userId;
if ($userId === null) {
$userId = $GLOBALS["USER"]->GetId();
}
static $timezoneCache = array();
if (isset($timezoneCache[$userIdKey]) && isset($timezoneCache[$userIdKey][$dateKey])) {
return $timezoneCache[$userIdKey][$dateKey];
}
$autoTimeZone = $userZone = '';
$factOffset = 0;
if ($date === null) {
$date = time();
}
static $userCache = array();
if ($userId === null) {
$autoTimeZone = trim($GLOBALS["USER"]->GetParam("AUTO_TIME_ZONE"));
$userZone = $GLOBALS["USER"]->GetParam("TIME_ZONE");
} else {
if (!isset($userCache[$userId])) {
$dbUser = CUser::GetByID($userId);
if ($arUser = $dbUser->Fetch()) {
$userCache[$userId] = array("AUTO_TIME_ZONE" => trim($arUser["AUTO_TIME_ZONE"]), "TIME_ZONE" => $arUser["TIME_ZONE"], "TIME_ZONE_OFFSET" => $arUser["TIME_ZONE_OFFSET"]);
}
}
if (isset($userCache[$userId])) {
$autoTimeZone = $userCache[$userId]["AUTO_TIME_ZONE"];
$userZone = $userCache[$userId]["TIME_ZONE"];
$factOffset = $userCache[$userId]["TIME_ZONE_OFFSET"];
}
}
if (CTimeZone::IsAutoTimeZone($autoTimeZone)) {
static $userOffsetCache = array();
if (!isset($userOffsetCache[$userId === null ? 0 : $userId])) {
$userOffsetCache[$userIdKey] = CTimeZone::GetOffset($userId);
}
$userOffset = $userOffsetCache[$userIdKey];
$localTime = new DateTime();
$localOffset = $localTime->getOffset();
$timezoneCache[$userIdKey][$dateKey] = CDavICalendarTimeZone::getTimezoneByOffset($date, $userOffset + $localOffset);
} else {
if ($userZone != '' && isset(self::$arTimeZones[$userZone])) {
$timezoneCache[$userIdKey][$dateKey] = $userZone;
} else {
$localTime = new DateTime();
$localOffset = $localTime->getOffset();
$timezoneCache[$userIdKey][$dateKey] = CDavICalendarTimeZone::getTimezoneByOffset($date, $factOffset + $localOffset);
}
}
return $timezoneCache[$userIdKey][$dateKey];
}
