public static function parse($timezone = null)
{
// Parse null
if ($timezone === null) {
return DateTimeZoneUtils::getDefaultTimezone();
}
// Parse DateTimeZone instances
if ($timezone instanceof self) {
return $timezone;
} else {
if ($timezone instanceof parent) {
return new self($timezone);
} else {
if ($timezone instanceof DateTime) {
return $timezone->getTimezone();
} else {
if ($timezone instanceof PHPDateTime) {
return new self($timezone->getTimezone());
}
}
}
}
// If the timezone is a string, make sure the timezone ID is valid, return the default value if not
if (is_string($timezone)) {
if (DateTimeZoneUtils::isValidTimezoneId($timezone)) {
return new self($timezone);
} else {
return null;
}
}
// Couldn't parse the timezone, return null
return null;
}
