在我看来，如果您在php语句之前从数据库中编辑数据，我认为这将是完美的：
mysql级别：

SELECT DATE_ADD( yourDate, INTERVAL 1 month ) from your table .

试试这个

$regdate = strtotime($row2['created_date']);
echo date('Y-m-d',strtotime("+1 month",$regdate));

请尝试以下操作：
在给定日期内添加1个月

$date = $row2['created_date'];
  $date = date("Y-m-d", strtotime(date("Y-m-d", strtotime($date)) . " +1 month") );
  echo $date;

您可以添加所需的时间段，如下所示：

Add day
$date = date("Y-m-d", strtotime(date("Y-m-d", strtotime($date)) . " +1 day") );

Multiple days
$date = date("Y-m-d", strtotime(date("Y-m-d", strtotime($date)) . " +15 days") );

Add week
$date = date("Y-m-d", strtotime(date("Y-m-d", strtotime($date)) . " +1 week") );

Add month
$date = date("Y-m-d", strtotime(date("Y-m-d", strtotime($date)) . " +1 month") );

试试这个

$regdate=$row2['created_date'];
$date = new DateTime($regdate);
$interval = new DateInterval('P1M');

$date->add($interval);
$onemonth = $date->format('Y-m-d');