diff --git a/classes/output/mobile.php b/classes/output/mobile.php
index 7ea7e9b..13ea491 100644
--- a/classes/output/mobile.php
+++ b/classes/output/mobile.php
@@ -70,6 +70,7 @@ class mobile {
 
         $attendance    = $DB->get_record('attendance', array('id' => $cm->instance), '*', MUST_EXIST);
         $course         = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);
+        $config = get_config('attendance');
 
         $data = array(); // Data to pass to renderer.
         $data['cmid'] = $cmid;
@@ -126,14 +127,15 @@ class mobile {
             }
         }
 
-        // Get list of sessions within the next 24hrs and in last 6hrs.
-        // TODO: provide way of adjusting which sessions to show in app.
-        $time = time() - (6 * 60 * 60);
+        // Get list of sessions based on site level settings. default = the next 24hrs and in last 6hrs.
+        $timefrom = time() - $config->mobilesessionfrom;
+        $timeto = time() + $config->mobilesessionto;
 
         $data['sessions'] = array();
 
         $sessions = $DB->get_records_select('attendance_sessions',
-            'attendanceid = ? AND sessdate > ? ORDER BY sessdate', array($attendance->id, $time));
+            'attendanceid = ? AND sessdate > ? AND sessdate < ? ORDER BY sessdate',
+            array($attendance->id, $timefrom, $timeto));
 
         if (!empty($sessions)) {
             $userdata = new \attendance_user_data($att, $USER->id, true);
diff --git a/lang/en/attendance.php b/lang/en/attendance.php
index 93abce7..0435a76 100644
--- a/lang/en/attendance.php
+++ b/lang/en/attendance.php
@@ -275,6 +275,12 @@ $string['maxpossiblepoints'] = 'Maximum possible points';
 $string['maxwarn'] = 'Maximum number of e-mail warnings';
 $string['maxwarn_help'] = 'The maximum number of times a warning should be sent (only one warning per session is sent)';
 $string['mergeuser'] = 'Merge user';
+$string['mobilesessionfrom'] = 'Show sessions older than the last';
+$string['mobilesessionfrom_help'] = 'Allows the list of sessions to be restricted when marking in the app - only shows sessions that started since this value';
+$string['mobilesessionto'] = 'Show future sessions';
+$string['mobilesessionto_help'] = 'Allows the list of sessions to be restricted to only show a small number of future sessions.';
+$string['mobilesettings'] = 'Mobile app settings';
+$string['mobilesettings_help'] = 'These settings control Moodle mobile app behaviour';
 $string['modulename'] = 'Attendance';
 $string['modulename_help'] = 'The attendance activity module enables a teacher to take attendance during class and students to view their own attendance record.
 
diff --git a/settings.php b/settings.php
index 88ce361..534f865 100644
--- a/settings.php
+++ b/settings.php
@@ -105,6 +105,18 @@ if ($ADMIN->fulltree) {
         get_string('enablewarnings', 'attendance'),
         get_string('enablewarnings_desc', 'attendance'), 0));
 
+    $name = new lang_string('mobilesettings', 'mod_attendance');
+    $description = new lang_string('mobilesettings_help', 'mod_attendance');
+    $settings->add(new admin_setting_heading('mobilesettings', $name, $description));
+
+    $settings->add(new admin_setting_configduration('attendance/mobilesessionfrom',
+        get_string('mobilesessionfrom', 'attendance'), get_string('mobilesessionfrom_help', 'attendance'),
+         6 * HOURSECS, PARAM_RAW));
+
+    $settings->add(new admin_setting_configduration('attendance/mobilesessionto',
+        get_string('mobilesessionto', 'attendance'), get_string('mobilesessionto_help', 'attendance'),
+        24 * HOURSECS, PARAM_RAW));
+
     $name = new lang_string('defaultsettings', 'mod_attendance');
     $description = new lang_string('defaultsettings_help', 'mod_attendance');
     $settings->add(new admin_setting_heading('defaultsettings', $name, $description));