Index: contributions/modules/date/date/date_admin.inc
--- contributions/modules/date/date/date_admin.inc Base (1.40.2.3.2.39)
+++ contributions/modules/date/date/date_admin.inc Locally Modified (Based On 1.40.2.3.2.39)
@@ -245,7 +245,7 @@
 
     case 'save':
 
-      $options = array('granularity', 'timezone_db', 'tz_handling', 'todate', 'repeat', 'repeat_collapsed', 'default_format');
+      $options = array('granularity', 'timezone_db', 'tz_handling', 'todate', 'repeat', 'repeat_collapsed', 'default_format', 'all_day');
       return $options;
 
     case 'database columns':
@@ -316,6 +316,9 @@
     $db_columns['offset'] = array('type' => 'int', 'not null' => FALSE, 'sortable' => TRUE, 'views' => FALSE);
     if (!empty($field['todate'])) $db_columns['offset2'] = array('type' => 'int', 'not null' => FALSE, 'sortable' => TRUE, 'views' => FALSE);
   }
+  if (isset($field['all_day']) && $field['all_day'] == TRUE) {
+    $db_columns['all_day'] = array('type' => 'int', 'length' => 1, 'not null' => FALSE, 'sortable' => FALSE);
+  }
   if (isset($field['repeat']) && $field['repeat'] == 1) {
     $db_columns['rrule'] = array('type' => 'text', 'not null' => FALSE, 'sortable' => FALSE, 'views' => FALSE);
   }
@@ -334,6 +337,7 @@
     $granularity = array('year', 'month', 'day', 'hour', 'minute');
   }
   $tz_handling = isset($field['tz_handling']) ? $field['tz_handling'] : (date_has_time($granularity) ? 'site' : 'none');
+  $all_day = isset($field['all_day']) ? $field['all_day'] : FALSE;
   
   // If adding a repeat, override the Content module's handling of the multiple values option.
   if (module_exists('date_repeat') && date_is_repeat_field($field)) {
@@ -380,6 +384,12 @@
     '#options' => date_timezone_handling_options(),
     '#description' => $description,
   );
+  $form['all_day'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('All-day checkbox'),
+    '#default_value' => $all_day,
+    '#description' => t('If turned on, all-day property of the dates can be handled.'),
+  );
   // Force this value to hidden because we don't want to allow it to be changed right now,
   // but allow it to be a variable if needed.
   $form['timezone_db'] = array(

Index: contributions/modules/date/date/date_elements.inc
--- contributions/modules/date/date/date_elements.inc Base (1.46.2.2.2.66)
+++ contributions/modules/date/date/date_elements.inc Locally Modified (Based On 1.46.2.2.2.66)
@@ -55,6 +55,13 @@
   $values = $items;
   foreach ($values as $delta => $item) {
 
+    if ($item['all_day'] == TRUE) {
+      $items[$delta]['value'] = date(DATE_FORMAT_DATE, strtotime($items[$delta]['value']));
+      if ($field['todate']) {
+        $items[$delta]['value2'] = date(DATE_FORMAT_DATE, strtotime($items[$delta]['value2']));
+      }
+    }
+
     // Special case for ISO dates which may have been given artificial values for
     // some date parts to make them into valid dates.
     if (!empty($item['value']) && $field['type'] == DATE_ISO) {
@@ -165,6 +172,17 @@
     _date_repeat_widget($element, $field, $items, $delta);
     $element['rrule']['#weight'] = $field['widget']['weight'] + .4;
   }
+
+  if ($field['all_day'] == TRUE) {
+    $element['all_day'] = array(
+      '#title' => t('All-day'),
+      '#type' => 'checkbox',
+      '#delta' => $delta,
+      '#default_value' => $items[$delta]['all_day'],
+      '#description' => t('Turn on if the date is all-day.'),
+    );
+  }
+
   return $element;
 }

Index: contributions/modules/date/theme/theme.inc
--- contributions/modules/date/theme/theme.inc Base (1.1.4.36)
+++ contributions/modules/date/theme/theme.inc Locally Modified (Based On 1.1.4.36)
@@ -188,6 +188,9 @@
         $events[$uid]['timezone'] = '';
       }
       $date_format = ($row->calendar_all_day == TRUE) ? DATE_FORMAT_ICAL_DATE : DATE_FORMAT_ICAL;
+      if ($event['end'] && $row->calendar_all_day == TRUE){
+        $event['end']->modify("+1 day");
+      }
       $events[$uid]['start'] = date_format($event['start'], $date_format);
       if ($event['start'] && $event['end']) {
         $events[$uid]['end'] = date_format($event['end'], $date_format);