diff --git a/LICENSE b/LICENSE
index 4eb750c..a7187a7 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2016, Stewart Lord
+Copyright (c) 2017, Stewart Lord
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
diff --git a/bower.json b/bower.json
index 236441c..2922e99 100644
--- a/bower.json
+++ b/bower.json
@@ -4,12 +4,12 @@
     "pnglib.js",
     "identicon.js"
   ],
-  "version": "2.1.1",
+  "version": "2.2.0",
   "homepage": "https://github.com/stewartlord/identicon.js",
   "authors": [
     "stewartlord"
   ],
-  "description": "GitHub-style identicons in JS with no server-side processing.",
+  "description": "GitHub-style identicons as PNGs or SVGs in JS.",
   "moduleType": [
     "globals"
   ],
diff --git a/demo.html b/demo.html
index 4424e46..9c56a2e 100644
--- a/demo.html
+++ b/demo.html
@@ -120,23 +120,6 @@ <h4>Raw (Smaller)</h4>
             </script>
         </div>
       </div>
-
-      <div class="row">
-        <div class="col-md-12">
-          <h4>Time-based</h4>
-          <p>Omit the hash to generate an identicon based on the current time.</p>
-<pre>
-  var data = new Identicon().toString();
-  document.write('&lt;img src="data:image/png;base64,' + data + '"&gt;');</pre>
-            <script type="text/javascript">
-
-              var data = new Identicon().toString();
-              document.write(
-                '<br><img src="data:image/png;base64,' + data + '"><br><br>'
-                );
-              </script>
-        </div>
-      </div>
     </div>
   </body>
 </html>
diff --git a/identicon.js b/identicon.js
index 77ae0d1..ea306f0 100644
--- a/identicon.js
+++ b/identicon.js
@@ -1,5 +1,5 @@
 /**
- * Identicon.js 2.1.1
+ * Identicon.js 2.2.0
  * http://github.com/stewartlord/identicon.js
  *
  * PNGLib required for PNG output
@@ -19,9 +19,12 @@
     }
 
     var Identicon = function(hash, options){
+        if (typeof(hash) !== 'string' || hash.length < 15) {
+            throw 'A hash of at least 15 characters is required.';
+        }
+
         this.defaults = {
             background: [240, 240, 240, 255],
-            hash:       this.createHashFromString((new Date()).toISOString()),
             margin:     0.08,
             size:       64,
             format:     'png'
@@ -33,7 +36,7 @@
         if (typeof(arguments[1]) === 'number') { this.options.size   = arguments[1]; }
         if (arguments[2])                      { this.options.margin = arguments[2]; }
 
-        this.hash        = hash                    || this.defaults.hash;
+        this.hash        = hash
         this.background  = this.options.background || this.defaults.background;
         this.margin      = this.options.margin     || this.defaults.margin;
         this.size        = this.options.size       || this.defaults.size;
@@ -128,24 +131,6 @@
             }
         },
 
-        // Creates a consistent-length hash from a string
-        createHashFromString: function(str){
-            var hash = '0', salt = 'identicon', i, chr, len;
-
-            if (!str) {
-                return hash;
-            }
-
-            str += salt + str; // Better randomization for short inputs.
-
-            for (i = 0, len = str.length; i < len; i++) {
-                chr   = str.charCodeAt(i);
-                hash  = ((hash << 5) - hash) + chr;
-                hash |= 0; // Convert to 32bit integer
-            }
-            return hash.toString();
-        },
-
         isSvg: function(){
             return this.format.match(/svg/i)
         }
diff --git a/package.json b/package.json
index 5739394..2b6725f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "identicon.js",
-  "version": "2.1.1",
+  "version": "2.2.0",
   "description": "GitHub-style identicons as PNGs or SVGs in JS.",
   "main": "identicon.js",
   "repository": {