Index: include/views/configuration.maintenance.edit.php
===================================================================
--- include/views/configuration.maintenance.edit.php	(revision 28018)
+++ include/views/configuration.maintenance.edit.php	(working copy)
@@ -59,7 +59,7 @@
 zbx_add_post_js('create_calendar(null, ["mntc_since_day", "mntc_since_month", "mntc_since_year", "mntc_since_hour", "mntc_since_minute"], "mntc_active_since", "active_since");');
 
 $calendarIcon->addAction('onclick', 'javascript: var pos = getPosition(this); pos.top += 10; pos.left += 16; CLNDR["mntc_active_till"].clndr.clndrshow(pos.top, pos.left); CLNDR["mntc_active_since"].clndr.clndrhide();');
-$maintenanceTillDay = new CNumericBox('mntc_till_day', $this->data['active_since'] > 0 ? date('d', $this->data['active_since']) : '', 2);
+$maintenanceTillDay = new CNumericBox('mntc_till_day', $this->data['active_since'] > 0 ? date('d', $this->data['active_till']) : '', 2);
 $maintenanceTillDay->setAttribute('placeholder', _('dd'));
 $maintenanceTillMonth = new CNumericBox('mntc_till_month', $this->data['active_till'] > 0 ? date('m', $this->data['active_till']) : '', 2);
 $maintenanceTillMonth->setAttribute('placeholder', _('mm'));