diff --git a/web/inc/main.php b/web/inc/main.php
index 52453696..13f12fd9 100644
--- a/web/inc/main.php
+++ b/web/inc/main.php
@@ -3,6 +3,7 @@
 // Check system settiongs
 if ((!isset($_SESSION['VERSION'])) && (!defined('NO_AUTH_REQUIRED'))) {
     session_destroy();
+    $_SESSION['request_uri'] = $_SERVER['REQUEST_URI'];
     header("Location: /login/");
     exit;
 }
@@ -241,4 +242,51 @@ function display_error_block() {
         unset($_SESSION['error_msg']);
     }
 }
+
+function list_timezones() {
+    $tz = new DateTimeZone('HAST');
+    $timezone_offsets['HAST'] = $tz->getOffset(new DateTime);
+    $tz = new DateTimeZone('HADT');
+    $timezone_offsets['HADT'] = $tz->getOffset(new DateTime);
+    $tz = new DateTimeZone('AKST');
+    $timezone_offsets['AKST'] = $tz->getOffset(new DateTime);
+    $tz = new DateTimeZone('AKDT');
+    $timezone_offsets['AKDT'] = $tz->getOffset(new DateTime);
+    $tz = new DateTimeZone('PST');
+    $timezone_offsets['PST'] = $tz->getOffset(new DateTime);
+    $tz = new DateTimeZone('PDT');
+    $timezone_offsets['PDT'] = $tz->getOffset(new DateTime);
+    $tz = new DateTimeZone('MST');
+    $timezone_offsets['MST'] = $tz->getOffset(new DateTime);
+    $tz = new DateTimeZone('MDT');
+    $timezone_offsets['MDT'] = $tz->getOffset(new DateTime);
+    $tz = new DateTimeZone('CST');
+    $timezone_offsets['CST'] = $tz->getOffset(new DateTime);
+    $tz = new DateTimeZone('CDT');
+    $timezone_offsets['CDT'] = $tz->getOffset(new DateTime);
+    $tz = new DateTimeZone('EST');
+    $timezone_offsets['EST'] = $tz->getOffset(new DateTime);
+    $tz = new DateTimeZone('EDT');
+    $timezone_offsets['EDT'] = $tz->getOffset(new DateTime);
+    $tz = new DateTimeZone('AST');
+    $timezone_offsets['AST'] = $tz->getOffset(new DateTime);
+    $tz = new DateTimeZone('ADT');
+    $timezone_offsets['ADT'] = $tz->getOffset(new DateTime);
+
+    foreach(DateTimeZone::listIdentifiers() as $timezone){
+        $tz = new DateTimeZone($timezone);
+        $timezone_offsets[$timezone] = $tz->getOffset(new DateTime);
+    }
+
+    foreach($timezone_offsets as $timezone => $offset){
+        $offset_prefix = $offset < 0 ? '-' : '+';
+        $offset_formatted = gmdate( 'H:i', abs($offset) );
+        $pretty_offset = "UTC${offset_prefix}${offset_formatted}";
+        $t = new DateTimeZone($timezone);
+        $c = new DateTime(null, $t);
+        $current_time = $c->format('H:i:s');
+        $timezone_list[$timezone] = "$timezone [ $current_time ] ${pretty_offset}";
+    }
+    return $timezone_list;
+}
 ?>