diff --git a/lib/Util.php b/lib/Util.php
new file mode 100644
index 0000000..4bf8f73
--- /dev/null
+++ b/lib/Util.php
@@ -0,0 +1,11 @@
+<?php
+    class Util
+    {
+        public static function diff($a, $b)
+        {
+            $a = intval(preg_replace("/[^0-9]/", "", $a));
+            $b = intval(preg_replace("/[^0-9]/", "", $b));
+            return abs($a - $b);
+        }
+    }
+?>
diff --git a/pages/user/info.php b/pages/user/info.php
new file mode 100644
index 0000000..7ff38fa
--- /dev/null
+++ b/pages/user/info.php
@@ -0,0 +1,66 @@
+<?php
+    global $c;
+    $varUser = UserAuth::getUser();
+    
+    if ($varUser == null)
+        Respond::redirect("/user/signin");
+
+    try
+    {
+        if (Request::posts("user_name", "display_name"))
+        {
+            $strUsername    = Request::getPosted("user_name");
+            $strDisplayName = Request::getPosted("display_name");
+
+            if (!preg_match("/^[A-Za-z0-9]{1,}$/", $strUsername))
+                throw new Exception("Username must be alphanumeric characters only");
+
+            $c->query(
+                "INSERT or replace into users (email, user_name, display_name)
+                select
+                    ?,
+                    ?,
+                    ?",
+                $varUser["email"],
+                $strUsername,
+                $strDisplayName);
+
+            PageRender::message("Profile updated", "success");
+        }
+    }
+    catch (Exception $x)
+    {
+        PageRender::message($x->getMessage(), "danger");
+    }
+
+    $strUsername = $varUser["username"];
+    PageRender::message("You are signed in as {$strUsername}.");
+?>
+
+<?php PageRender::message(); ?>
+
+<table>
+    <tbody>
+        <tr>
+            <td><label>Username</label></td>
+            <td><?= $varUser["username"]; ?></td>
+        </tr>
+
+        <tr>
+            <td><label>Created</label></td>
+            <td><?= $varUser["created"]; ?></td>
+        </tr>
+
+        <?php if (Request::getParam("more")): ?>
+            <tr>
+                <td><label>Token</label></td>
+                <td><?= $varUser["token"]; ?></td>
+            </tr>
+        <?php endif; ?>
+    </tbody>
+</table>
+
+<ul>
+    <li><a href="?more=1">More</a></li>
+    <li><a href="/user/signout">Sign out</a></li>
+</ul>