--- a/include/common-transit.inc.php
+++ b/include/common-transit.inc.php
@@ -4,9 +4,26 @@
 	'saturday',
 	'weekday'
 );
+function getServiceOverride() {
+	global $conn;
+	$query = "Select * from calendar_dates where date = '".date("Ymd")."' and exception_type = '1'";
+	 debug($query,"database");
+	$result = pg_query($conn, $query);
+	if (!$result) {
+		databaseError(pg_result_error($result));
+		return Array();
+	}
+	return pg_fetch_assoc($result);
+}
 function service_period()
 {
+	
 	if (isset($_SESSION['service_period'])) return $_SESSION['service_period'];
+	$override = getServiceOverride();
+	if ($override['service_id']){
+		return $override['service_id'];
+	}
+
 	switch (date('w')) {
 	case 0:
 		return 'sunday';