diff -upr ./tmp/date/date/date_admin.inc ./date/date/date_admin.inc
--- ./tmp/date/date/date_admin.inc	2009-02-27 09:05:21.000000000 -0800
+++ ./date/date/date_admin.inc	2009-03-23 13:58:21.000000000 -0700
@@ -245,7 +245,8 @@ function _date_field_settings($op, $fiel
 
     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':
@@ -311,6 +312,9 @@ function date_columns($field) {
     $db_columns['offset'] = array('type' => 'int', 'not null' => FALSE, 'sortable' => TRUE, 'views' => FALSE);
     if (!empty($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) {
     $db_columns['rrule'] = array('type' => 'text', 'not null' => FALSE, 'sortable' => FALSE, 'views' => FALSE);
   }
@@ -329,6 +333,7 @@ function date_field_settings_form($field
     $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($field)) {
@@ -365,7 +370,6 @@ function date_field_settings_form($field
     '#options' => $format_types,
     '#description' => t('Select a default format type to be used for the date display. Visit the <a href="@date-time-page">Date and time date format page</a> to add and edit format types.', array('@date-time-page' => base_path() .'admin/settings/date-time/formats')),
     );
-
   $description = t('Select the timezone handling method to be used for this date field.');
   $description .= date_data_loss_warning('Time zone handling');
   $form['tz_handling'] = array(
@@ -375,6 +379,13 @@ function date_field_settings_form($field
     '#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.
   $form['timezone_db'] = array(
@@ -707,4 +718,4 @@ function _date_formatter_settings($form_
       );  
   }
   return $form;
-}
\ No newline at end of file
+}
Only in ./date/date: date_all_day.js
diff -upr ./tmp/date/date/date_elements.inc ./date/date/date_elements.inc
--- ./tmp/date/date/date_elements.inc	2009-02-27 07:47:39.000000000 -0800
+++ ./date/date/date_elements.inc	2009-03-23 13:57:01.000000000 -0700
@@ -60,9 +60,17 @@ function _date_field_update($op, &$node,
       continue;
     }
 
+    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 ($field['type'] == DATE_ISO) {
+    elseif ($field['type'] == DATE_ISO) {
+
       $items[$delta]['value'] = date_limit_value($items[$delta]['value'], date_granularity($field), $field['type']);
       if ($field['todate']) {
         $items[$delta]['value2'] = date_limit_value($items[$delta]['value2'], date_granularity($field), $field['type']);
@@ -170,6 +178,19 @@ function _date_widget(&$form, &$form_sta
     _date_repeat_widget($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.'),
+      '#attributes' => array('onclick' => 'dateAllDayToggle(this.checked, \''. str_replace('_', '-', $field['field_name']) .'\', \''. $field['required'] .'\')'),
+    );
+    drupal_add_js(drupal_get_path('module', 'date') .'/date_all_day.js');
+  }
+
   return $element;
 }
 
diff -upr ./tmp/date/theme/theme.inc ./date/theme/theme.inc
--- ./tmp/date/theme/theme.inc	2009-02-17 09:04:31.000000000 -0800
+++ ./date/theme/theme.inc	2009-03-23 13:52:47.000000000 -0700
@@ -159,6 +159,9 @@ function template_preprocess_date_vcalen
         $events[$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'], $date_format);
@@ -325,4 +328,4 @@ function theme_date_part_label_ampm($par
 }
 function theme_date_part_label_timezone($part_type, $element) {
   return t('Timezone');
-}
\ No newline at end of file
+}