diff --git a/admin/settings/appearance.php b/admin/settings/appearance.php
index 58677118e0ecf..a8b6c6aeb450f 100644
--- a/admin/settings/appearance.php
+++ b/admin/settings/appearance.php
@@ -64,7 +64,8 @@
                                               array('0'        => new lang_string('default', 'calendar'),
                                                     '%I:%M %p' => new lang_string('timeformat_12', 'calendar'),
                                                     '%H:%M'    => new lang_string('timeformat_24', 'calendar'))));
-    $temp->add(new admin_setting_configselect('calendar_startwday', new lang_string('configstartwday', 'admin'), new lang_string('helpstartofweek', 'admin'), 0,
+    $temp->add(new admin_setting_configselect('calendar_startwday', new lang_string('configstartwday', 'admin'),
+        new lang_string('helpstartofweek', 'admin'), get_string('firstdayofweek', 'langconfig'),
     array(
             0 => new lang_string('sunday', 'calendar'),
             1 => new lang_string('monday', 'calendar'),
diff --git a/lang/en/langconfig.php b/lang/en/langconfig.php
index f44d7f9a23e26..48eaf09cc39c4 100644
--- a/lang/en/langconfig.php
+++ b/lang/en/langconfig.php
@@ -25,7 +25,7 @@
 $string['alphabet'] = 'A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z';
 $string['backupnameformat'] = '%Y%m%d-%H%M';
 $string['decsep'] = '.';
-$string['firstdayofweek'] = '0';
+$string['firstdayofweek'] = '1';
 $string['iso6391'] = 'en';
 $string['iso6392'] = 'eng';
 $string['labelsep'] = ': ';
diff --git a/lib/formslib.php b/lib/formslib.php
index d82f79a26fcbb..e65979c76963b 100644
--- a/lib/formslib.php
+++ b/lib/formslib.php
@@ -77,10 +77,11 @@ function form_init_date_js() {
     global $PAGE;
     static $done = false;
     if (!$done) {
+        $calendar = \core_calendar\type_factory::get_calendar_instance();
         $module   = 'moodle-form-dateselector';
         $function = 'M.form.dateselector.init_date_selectors';
         $config = array(array(
-            'firstdayofweek'    => get_string('firstdayofweek', 'langconfig'),
+            'firstdayofweek'    => $calendar->get_starting_weekday(),
             'mon'               => date_format_string(strtotime("Monday"), '%a', 99),
             'tue'               => date_format_string(strtotime("Tuesday"), '%a', 99),
             'wed'               => date_format_string(strtotime("Wednesday"), '%a', 99),