bad timeend with manual enrol

Hi,

The calculated timeend returns false value with manual enrolment.
Steps :

• manually enrol a user in a course ( ex: today Feb 01 2018 )
• set the duration to 180 days and save
• Display user's enrolment informations :
  end date is : Jan 06 44598

I search for the error and found that the problem is in the scrolling list for duration.

In my old Moodle 3.1.5, values for this list are like this

<option value="180">180 days</option>

In Moodle 3.4.1 , values are like this

<option value="15552000">180 days</option>

But the calcul for timeend not change in file /enrol/manual/ajax.php, it's always :

$timeend = $timestart + intval($duration*24*60*60);

As workoraund, I just remove "*24*60*60" from the code and it works.

Thank's a lot

Bruno Malaval