Mysqli日期早于今天的日期，它将不会显示在页面上

$mysqli = new mysqli("localhost", $username, $password, $database);

$query = "SELECT code , value , type ,expirationdate, notes, startdate FROM tblpromotions"; echo "

while ($row = $result->fetch_assoc()) { $field1name = $row["code"]; $field2name = $row["value"]; $field3name = $row["type"]; $field4name = $row["expirationdate"]; $field5name = $row["notes"]; $field6name = $row["startdate"]; 我无法弄清楚如何使其更旧的日期不会显示在页面exp上

expirationdate = 12/1/2019，然后今天是12/8/2019 该表将不会显示在页面上

如果帖子已过期，我不想显示它们？