Do not use invalid date value '0000-00-00'

NeatlineTimePlugin.php

@@ -55,8 +55,8 @@ public function hookInstall()
             `creator_id` INT UNSIGNED NOT NULL,
             `public` TINYINT(1) UNSIGNED NOT NULL DEFAULT '0',
             `featured` TINYINT(1) NOT NULL DEFAULT '0',
-            `center_date` date NOT NULL default '0000-00-00',
-            `added` timestamp NOT NULL default '0000-00-00 00:00:00',
+            `center_date` date NULL,
+            `added` timestamp NOT NULL default CURRENT_TIMESTAMP,
             `modified` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
             PRIMARY KEY (`id`)
             ) ENGINE=innodb DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci";
@@ -124,6 +124,16 @@ public function hookUpgrade($args)
             $this->_db->query($sqlNeatlineTimeline);
           }
         }
+
+        if (version_compare($oldversion, '2.1.1', '<')) {
+            $sql = "
+                ALTER TABLE  `{$this->_db->prefix}neatline_time_timelines`
+                MODIFY COLUMN `center_date` date NULL,
+                MODIFY COLUMN `added` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
+            ";
+
+            $this->_db->query($sql);
+        }
     }
 
     /**

models/NeatlineTimeTimeline.php

@@ -64,9 +64,9 @@ protected function _validate()
     {
       $validator = new Zend_Validate_Date(array('format' => 'yyyy-MM-dd'));
       if ($this->center_date == '') {
-        $this->center_date = '0000-00-00';
-      } elseif ($this->center_date !== '0000-00-00' && !$validator->isValid($this->center_date)) {
+        $this->center_date = null;
+      } elseif (isset($this->center_date) && !$validator->isValid($this->center_date)) {
         $this->addError(null, __('The center date must be in the format YYYY-MM-DD.'));
-      } 
+      }
     }
 }

plugin.ini

@@ -5,7 +5,7 @@
   link="http://neatline.org/"
   omeka_minimum_version="2.0"
   omeka_tested_up_to="2.3"
-  version="2.1.0"
+  version="2.1.1"
   tags="timelines, chronology"
   support_link="http://github.com/scholarslab/NeatlineTime/issues"
   omeka_target_version="2.0"

views/shared/timelines/_timeline.php

@@ -9,7 +9,7 @@
 </div>
 <script>
   jQuery(document).ready(function($) {
-        var centerDate = '<?php echo $this->center_date; ?>';
+        var centerDate = <?php echo json_encode($this->center_date); ?>;
 
         NeatlineTime.loadTimeline(
             '<?php echo neatlinetime_timeline_id(); ?>',