diff -Naur old/calendar.php new/calendar.php
--- old/calendar.php	2012-01-30 12:29:41.000000000 +0530
+++ new/calendar.php	2012-04-15 15:06:01.000000000 +0530
@@ -97,6 +97,7 @@
 $string['monthnext'] = 'Next month';
 $string['monththis'] = 'This month';
 $string['newevent'] = 'New event';
+$string['adjustdeadline'] = 'Adjust deadlines';
 $string['noupcomingevents'] = 'There are no upcoming events';
 $string['oneevent'] = '1 event';
 $string['preferences'] = 'Preferences';
diff -Naur old/renderer.php new/renderer.php
--- old/renderer.php	2012-02-13 15:34:34.000000000 +0530
+++ new/renderer.php	2012-04-15 15:09:30.169840214 +0530
@@ -208,6 +208,17 @@
         return $output;
     }
 
+protected function adjust_deadline_button($courseid, $day=null, $month=null, $year=null) {
+        $output = html_writer::start_tag('div', array('class'=>'buttons'));
+        $output .= html_writer::start_tag('form', array('action'=>CALENDAR_URL.'event1.php', 'method'=>'get'));
+        $output .= html_writer::start_tag('div');
+        $output .= html_writer::empty_tag('input', array('type'=>'submit', 'value'=>get_string('adjustdeadline', 'calendar')));
+        $output .= html_writer::end_tag('div');
+        $output .= html_writer::end_tag('form');
+        $output .= html_writer::end_tag('div');
+        return $output;
+    }
+
     /**
      * Displays the calendar for a single day
      *
@@ -221,6 +232,7 @@
         $output  = html_writer::start_tag('div', array('class'=>'header'));
         if (!isguestuser() && isloggedin() && calendar_user_can_add_event()) {
             $output .= $this->add_event_button($calendar->courseid, $calendar->day, $calendar->month, $calendar->year);
+            $output .= $this->adjust_deadline_button($calendar->courseid, $calendar->day, $calendar->month, $calendar->year);
         }
         //$output .= html_writer::tag('label', get_string('dayview', 'calendar'), array('for'=>'cal_course_flt_jump'));
         $output .= $this->course_filter_selector(array('from'=>'day', 'cal_d'=>$calendar->day, 'cal_m'=>$calendar->month, 'cal_y'=>$calendar->year), get_string('dayview', 'calendar'));
@@ -396,6 +408,7 @@
         $output  = html_writer::start_tag('div', array('class'=>'header'));
         if(!isguestuser() && isloggedin() && calendar_user_can_add_event()) {
             $output .= $this->add_event_button($calendar->courseid, null, $calendar->month, $calendar->year);
+            $output .= $this->adjust_deadline_button($calendar->courseid, null, $calendar->month, $calendar->year);
         }
         $output .= get_string('detailedmonthview', 'calendar').': '.$this->course_filter_selector(array('from'=>'month', 'cal_d'=>$calendar->day, 'cal_m'=>$calendar->month, 'cal_y'=>$calendar->year));
         $output .= html_writer::end_tag('div', array('class'=>'header'));
@@ -621,6 +634,7 @@
         $output  = html_writer::start_tag('div', array('class'=>'header'));
         if (!isguestuser() && isloggedin() && calendar_user_can_add_event()) {
             $output .= $this->add_event_button($calendar->courseid);
+            $output .= $this->adjust_deadline_button($calendar->courseid);
         }
         $output .= html_writer::tag('label', get_string('upcomingevents', 'calendar'), array('for'=>'cal_course_flt_jump'));
         $output .= $this->course_filter_selector(array('from'=>'upcoming'));
@@ -683,4 +697,4 @@
         }
         return $this->output->render($select);
     }
-}
\ No newline at end of file
+}