是一个基于PHP+Mysql架构的开源内容管理系统

								if($dateformat == 'date')
				{
					$sql = "ALTER TABLE `$tablename` CHANGE `$field` `$field` DATE NOT NULL DEFAULT '0000-00-00'";
				}
				elseif($dateformat == 'datetime')
				{
					$sql = "ALTER TABLE `$tablename` CHANGE `$field` `$field` DATETIME NOT NULL DEFAULT '0000-00-00 00:00:00'";
				}
				elseif($dateformat == 'int')
				{
					if($format)
					$sql = "ALTER TABLE `$tablename` CHANGE `$field` `$field` INT UNSIGNED NOT NULL DEFAULT '0'";
				}
				
				$db->query($sql);
				?>