diff --git a/application/config/migration.php b/application/config/migration.php
index aabac391..947334c3 100644
--- a/application/config/migration.php
+++ b/application/config/migration.php
@@ -21,7 +21,7 @@ $config['migration_enabled'] = TRUE;
 | be upgraded / downgraded to.
 |
 */
-$config['migration_version'] = 10;
+$config['migration_version'] = 12;
 
 
 /*
diff --git a/application/controllers/update.php b/application/controllers/update.php
index 17c5d53d..5896c2e7 100644
--- a/application/controllers/update.php
+++ b/application/controllers/update.php
@@ -30,8 +30,10 @@ class Update extends CI_Controller {
 
         $count = 0;
 		foreach ($xml_data->entities->entity as $entity) {
-            $endinfo = strtotime($entity->end);
+			$startinfo = strtotime($record->start);
+            $endinfo = strtotime($record->end);
             
+            $start_date = ($startinfo) ? date('Y-m-d H:i:s',$startinfo) : "";
             $end_date = ($endinfo) ? date('Y-m-d H:i:s',$endinfo) : "";
         
             if(!$entity->cqz) {
@@ -48,6 +50,7 @@ class Update extends CI_Controller {
                     'cont' => (string) $entity->cont,
                     'long' => (float) $entity->long,
                     'lat' => (float) $entity->lat,
+                	'start' => $start_date,
                     'end' => $end_date,
                 );	
             }
@@ -113,6 +116,12 @@ class Update extends CI_Controller {
 		
         $count = 0;
 		foreach ($xml_data->prefixes->prefix as $record) {
+			$startinfo = strtotime($record->start);
+            $endinfo = strtotime($record->end);
+            
+            $start_date = ($startinfo) ? date('Y-m-d H:i:s',$startinfo) : "";
+            $end_date = ($endinfo) ? date('Y-m-d H:i:s',$endinfo) : "";
+            
             $data = array(
             	'record' => (int) $record->attributes()->record,
             	'call' => (string) $record->call,
@@ -122,6 +131,8 @@ class Update extends CI_Controller {
                 'cont' => (string) $record->cont,
                 'long' => (float) $record->long,
                 'lat' => (float) $record->lat,
+                'start' => $start_date,
+                'end' => $end_date,
             );
        
             $this->db->insert('dxcc_prefixes', $data); 
@@ -206,9 +217,9 @@ class Update extends CI_Controller {
         }
 	}
 	
-	public function check_missing_dxcc(){
+	public function check_missing_dxcc($all = false){
 	    $this->load->model('logbook_model');
-        $this->logbook_model->check_missing_dxcc_id();
+        $this->logbook_model->check_missing_dxcc_id($all);
 
 	}
 
diff --git a/application/migrations/011_add_dxcc_prefixes_start_end.php b/application/migrations/011_add_dxcc_prefixes_start_end.php
new file mode 100644
index 00000000..db01bd41
--- /dev/null
+++ b/application/migrations/011_add_dxcc_prefixes_start_end.php
@@ -0,0 +1,23 @@
+<?php defined('BASEPATH') OR exit('No direct script access allowed');
+
+class Migration_add_dxcc_prefixes_start_end extends CI_Migration {
+
+  public function up(){
+    $fields = (array(
+      'start' => array(
+        'type' => 'date',
+        'Null' => TRUE
+      ),
+      'end' => array(
+        'type' => 'date',
+        'Null' => TRUE
+      ),
+    ));
+
+    $this->dbforge->add_column('dxcc_prefixes', $fields);
+  }
+
+  public function down(){
+    $this->dbforge->drop_table('dxcc_prefixes');
+  }
+}
diff --git a/application/migrations/012_add_dxcc_entities_start.php b/application/migrations/012_add_dxcc_entities_start.php
new file mode 100644
index 00000000..f73b2a57
--- /dev/null
+++ b/application/migrations/012_add_dxcc_entities_start.php
@@ -0,0 +1,19 @@
+<?php defined('BASEPATH') OR exit('No direct script access allowed');
+
+class Migration_add_dxcc_entities_start extends CI_Migration {
+
+  public function up(){
+    $fields = (array(
+      'start' => array(
+        'type' => 'date',
+        'Null' => TRUE
+      ),
+    ));
+
+    $this->dbforge->add_column('dxcc_entities', $fields);
+  }
+
+  public function down(){
+    $this->dbforge->drop_table('dxcc_entities');
+  }
+}
diff --git a/application/models/logbook_model.php b/application/models/logbook_model.php
index 8a1ea66a..3a628f35 100644
--- a/application/models/logbook_model.php
+++ b/application/models/logbook_model.php
@@ -941,15 +941,22 @@ class Logbook_model extends CI_Model {
     }
 
 
-    private function check_dxcc_table($call){
-        global $con;
+    private function check_dxcc_table($call, $date){
         $len = strlen($call);
 
         // query the table, removing a character from the right until a match
         for ($i = $len; $i > 0; $i--){
             //printf("searching for %s\n", substr($call, 0, $i));
-            $dxcc_result = $this->db->query("select `call`, `entity`, `adif` from dxcc_prefixes where `call` = '".substr($call, 0, $i) ."'");
+            $dxcc_result = $this->db->select('`call`, `entity`, `adif`')
+                                    ->where('call', substr($call, 0, $i))
+                                    ->where('(start <= ', $date)
+                                    ->or_where("start = '0000-00-00')", NULL, false)
+                                    ->where('(end >= ', $date)
+                                    ->or_where("end = '0000-00-00')", NULL, false)
+                                    ->get('dxcc_prefixes');
 
+            //$dxcc_result = $this->db->query("select `call`, `entity`, `adif` from dxcc_prefixes where `call` = '".substr($call, 0, $i) ."'");
+            //print $this->db->last_query();
 
             if ($dxcc_result->num_rows() > 0){
                 $row = $dxcc_result->row_array();
@@ -960,10 +967,15 @@ class Logbook_model extends CI_Model {
         return array("Not Found", "Not Found");
     }
 
-    public function check_missing_dxcc_id(){
+    public function check_missing_dxcc_id($all){
         // get all records with no COL_DXCC
-        $this->db->select("COL_PRIMARY_KEY, COL_CALL");
-        $this->db->where("COL_DXCC is NULL");
+        $this->db->select("COL_PRIMARY_KEY, COL_CALL, COL_TIME_ON, COL_TIME_OFF");
+
+        // check which to update - records with no dxcc or all records
+        if (! isset($all)){
+            $this->db->where("COL_DXCC is NULL");
+        }
+
         $r = $this->db->get($this->config->item('table_name'));
 
         $count = 0;
@@ -971,13 +983,17 @@ class Logbook_model extends CI_Model {
         //query dxcc_prefixes
         if ($r->num_rows() > 0){
             foreach($r->result_array() as $row){
-                $d = $this->check_dxcc_table($row['COL_CALL']);
+                $qso_date = $row['COL_TIME_OFF']=='' ? $row['COL_TIME_ON'] : $row['COL_TIME_ON'];
+                $qso_date = strftime("%Y-%m-%d", strtotime($qso_date));
+
+                $d = $this->check_dxcc_table($row['COL_CALL'], $qso_date);
+
                 if ($d[0] != 'Not Found'){
                     $sql = sprintf("update %s set COL_COUNTRY = '%s', COL_DXCC='%s' where COL_PRIMARY_KEY=%d",
-                                    $this->config->item('table_name'), addslashes($d[1]), $d[0], $row['COL_PRIMARY_KEY']);
+                                    $this->config->item('table_name'), addslashes(ucwords(strtolower($d[1]))), $d[0], $row['COL_PRIMARY_KEY']);
                     $this->db->query($sql);
                     //print($sql."\n");
-                    printf("Updating %s to %s and %s\n<br/>", $row['COL_PRIMARY_KEY'], $d[1], $d[0]);
+                    printf("Updating %s to %s and %s\n<br/>", $row['COL_PRIMARY_KEY'], ucwords(strtolower($d[1])), $d[0]);
                     $count++;
                 }
             }
diff --git a/application/views/update/index.php b/application/views/update/index.php
index d1c06992..f8a64a7f 100644
--- a/application/views/update/index.php
+++ b/application/views/update/index.php
@@ -9,6 +9,7 @@
     </div>
 <br/>
     <a href="update/check_missing_dxcc">Check missing DXCC/Countries values</a>
+    <a href="update/check_missing_dxcc/all">[Re-Check ALL]</a>
 </div>
 
 <style>