CCalendar::GetMinDate

static function GetMinDate()
{
	if (!self::$CALENDAR_MIN_DATE)
	{
		$date = new DateTime();
		$date->setDate(1970, 1, 1);
		self::$CALENDAR_MIN_DATE = self::Date($date->getTimestamp(), false);
	}
	return self::$CALENDAR_MIN_DATE;
}