Hiding a link depending on date in PHP

I am displaying a number of dates using PHP and I need to hide them when a certain date has expired.

I am using an IF statement to run this but it doesn't seem to be working.

Any suggestions would be great

<?PHP if('09-19-2016'<DATE('m-d-Y') || $_SESSION['role'] == 'Administrator') echo('<li><a href="?page=itRooms&weekId=2">Week 2 - W/C 12/09/2016</li></a>');?>