diff --git a/.gitignore b/.gitignore
index f0b547b..fed987d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,7 +5,7 @@
 
 # Node and Grunt files
 node_modules
-
+Gruntfile.js
 
 ## Core latex/pdflatex auxiliary files:
 *.aux
diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index f3f88b4..260c2bd 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -2,10 +2,12 @@
 
 ## Release notes
 
-### Version 1.4.5, 2017-04-xx
+### Version 1.5, 2017-04-14
 
-* Code refactored, not using eval() any more, issue #12
-* TO BE CONTINUED
+* Code doesn't use eval() any more, issue #12
+* Javascript code refactored, using AMD, issue #11
+* Documentation updated (release notes have their own file now), issue #13
+* Plugin is now published on Moodle plugin database
 
 ### Version 1.4.4, 2017-04-11
 
diff --git a/amd/build/timediff.min.js b/amd/build/timediff.min.js
new file mode 100644
index 0000000..19ae61d
--- /dev/null
+++ b/amd/build/timediff.min.js
@@ -0,0 +1 @@
+define(["core/str","core/notification"],function(a,b){return{init:function(c){var d=Math.round(M.pageloadstarttime.getTime()/1e3);Math.abs(d-c)>=300&&a.get_strings([{key:"datetimesetmessage",component:"tool_moodlebox"}]).done(function(a){b.addNotification({message:a[0],type:"error"})}).fail(b.exception)}}});
\ No newline at end of file
diff --git a/amd/src/timediff.js b/amd/src/timediff.js
new file mode 100644
index 0000000..d550166
--- /dev/null
+++ b/amd/src/timediff.js
@@ -0,0 +1,47 @@
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/*
+ * @see        https://github.com/martignoni/moodle-tool_moodlebox
+ * @package    tool_moodlebox
+ * @copyright  2016 onwards Nicolas Martignoni <nicolas@martignoni.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+/**
+  * @module tool_moodlebox/timediff
+  */
+define(['core/str', 'core/notification'], function(str, notification) {
+
+    return /** @alias module:tool/moodlebox */ {
+        /**
+         * Global init function for this module.
+         *
+         * @method init
+         * @param {Object} servertime The timestamp of current time on the server.
+         */
+        init: function(servertime) {
+            var usertime = Math.round(M.pageloadstarttime.getTime() / 1000);
+            if (Math.abs(usertime - servertime) >= 300) { // time difference greater than 5 minutes
+                str.get_strings([{'key': 'datetimesetmessage', component: 'tool_moodlebox'},]).done(function(s) {
+                    notification.addNotification({
+                        message: s[0],
+                        type: 'error'
+                    });
+                }).fail(notification.exception);
+            }
+        }
+    };
+});
diff --git a/index.php b/index.php
index f7016bd..c6c0139 100644
--- a/index.php
+++ b/index.php
@@ -69,10 +69,8 @@
 
 if ( strpos($platform, 'rpi') !== false ) { // We are on a RPi.
 
-    $PAGE->requires->js('/admin/tool/moodlebox/utils.js');
     $systemtime = usergetdate(time())[0];
-
-    $PAGE->requires->js_init_call('checktime', array($systemtime));
+    $PAGE->requires->js_call_amd('tool_moodlebox/timediff', 'init', array($systemtime));
 
     // Get kernel version
     $kernelversion = php_uname('s') . ' ' . php_uname('r') . ' ' .  php_uname('m');
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..f8cacd0
--- /dev/null
+++ b/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "moodle-tool_moodlebox",
+  "devDependencies": {
+    "grunt": "^1.0.1",
+    "grunt-contrib-less": "^1.4.1",
+    "grunt-contrib-uglify": "^2.3.0",
+    "grunt-contrib-watch": "^1.0.0",
+    "grunt-eslint": "^19.0.0",
+    "grunt-load-gruntfile": "0.0.2",
+    "grunt-stylelint": "^0.7.0"
+  }
+}
diff --git a/utils.js b/utils.js
deleted file mode 100644
index 5cc489c..0000000
--- a/utils.js
+++ /dev/null
@@ -1,14 +0,0 @@
-var checktime = function(Y, servertime) {
-    var usertime = Math.round(M.pageloadstarttime.getTime() / 1000);
-    if (Math.abs(usertime - servertime) >= 60) { // time difference greater than 1 minute
-        require(['core/str', 'core/notification'], function(str, notification) {
-            str.get_strings([{'key': 'datetimesetmessage', component: 'tool_moodlebox'},]).done(function(s) {
-                notification.addNotification({
-                    message: s[0],
-                    type: 'error'
-                });
-            }).fail(notification.exception);
-        });
-    }
-    return usertime;
-}
diff --git a/version.php b/version.php
index 61ad195..ca4c999 100644
--- a/version.php
+++ b/version.php
@@ -26,8 +26,8 @@
 
 $plugin = new stdClass();
 
-$plugin->version  = 2017041200;
-$plugin->release = '1.4.5dev';
+$plugin->version  = 2017041400;
+$plugin->release = '1.5';
 $plugin->requires = 2015051103;
 $plugin->maturity = MATURITY_STABLE;
 $plugin->component = 'tool_moodlebox';