diff --git a/main/attendance/attendance_controller.php b/main/attendance/attendance_controller.php
index fbf1bb504d..21b993cf54 100755
--- a/main/attendance/attendance_controller.php
+++ b/main/attendance/attendance_controller.php
@@ -201,6 +201,7 @@
 		}
 				
 		$data['next_attendance_calendar_id'] = $attendance->get_next_attendance_calendar_id($attendance_id);
+		$data['next_attendance_calendar_datetime'] = $attendance->get_next_attendance_calendar_datetime($attendance_id);
 		
 		if (strtoupper($_SERVER['REQUEST_METHOD']) == "POST") {	
 
@@ -218,6 +219,7 @@
 			$data['attendant_calendar'] 		 = $attendance->get_attendance_calendar($attendance_id);
 			$data['users_presence'] 			 = $attendance->get_users_attendance_sheet($attendance_id);
 			$data['next_attendance_calendar_id'] = $attendance->get_next_attendance_calendar_id($attendance_id);			
+			$data['next_attendance_calendar_datetime'] = $attendance->get_next_attendance_calendar_datetime($attendance_id);			
 		}
 		
 		$this->view->set_data($data);
diff --git a/main/attendance/attendance_sheet.php b/main/attendance/attendance_sheet.php
index 55a8a7aaf7..8fe2101a6b 100755
--- a/main/attendance/attendance_sheet.php
+++ b/main/attendance/attendance_sheet.php
@@ -115,8 +115,10 @@ if (api_is_allowed_to_edit(null, true)) {
 					<tr class="<?php echo $class ?>">
 					<?php
 						if (count($attendant_calendar) > 0 ) {
-							foreach ($attendant_calendar as $calendar) {
+							foreach ($attendant_calendar as $key => $calendar) {
+								//error_log(print_r($calendar,1));
 								$checked = 'checked';
+								// if the 
 								if (isset($users_presence[$user['user_id']][$calendar['id']]['presence'])) {
 									$presence = $users_presence[$user['user_id']][$calendar['id']]['presence'];
 									if (intval($presence) == 1) {
@@ -124,9 +126,15 @@ if (api_is_allowed_to_edit(null, true)) {
 									} else {
 										$checked = '';
 									}
+								} else {
+									//if the user wasn't registered at that time, consider unchecked
+									if ($next_attendance_calendar_datetime == 0 || $calendar['date_time'] < $next_attendance_calendar_datetime) {
+										$checked = '';
+									}
 								}
 								$disabled = 'disabled';
 								$style_td = '';
+								// if this is the active column, then set it to darker background and enable it
 								if ($next_attendance_calendar_id == $calendar['id']) {
 									$style_td = 'background-color:#e1e1e1';
 									$disabled = '';
diff --git a/main/inc/lib/attendance.lib.php b/main/inc/lib/attendance.lib.php
index 45c1696ee8..b169c90628 100755
--- a/main/inc/lib/attendance.lib.php
+++ b/main/inc/lib/attendance.lib.php
@@ -639,6 +639,24 @@ class Attendance
 		return $next_calendar_id;
 	}
 
+	/**
+	 * Get next attendance calendar datetime without presences (done attendances)
+	 * @param	int	attendance id
+	 * @return 	int UNIX time format datetime
+	 */
+	public function get_next_attendance_calendar_datetime($attendance_id) {
+		$tbl_attendance_calendar = Database::get_course_table(TABLE_ATTENDANCE_CALENDAR);
+		$attendance_id = intval($attendance_id);
+		$sql = "SELECT id, date_time FROM $tbl_attendance_calendar WHERE attendance_id = '$attendance_id' AND done_attendance = 0 ORDER BY date_time limit 1";
+		$rs = Database::query($sql);
+		$next_calendar_datetime = 0;
+		if (Database::num_rows($rs) > 0) {
+			$row = Database::fetch_array($rs);
+			$next_calendar_datetime = api_get_local_time($row['date_time']);
+		}
+		return $next_calendar_datetime;
+	}
+
 	/**
 	 * Get user' score from current attendance
 	 * @param	int	user id