diff --git a/lib/index.js b/lib/index.js
index 22f7855..3dccd72 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -76,8 +76,8 @@
                 case 'w': return d.getDay(); // 0 - 6, Sunday is first day of the week
                 case 'Y': return d.getFullYear();
                 case 'y':
-                    var year = d.getYear();
-                    return year < 100 ? year : year - 100;
+                    var y = String(d.getFullYear());
+                    return y.slice(y.length - 2);
                 case 'Z':
                     var tz = d.toString().match(/\((\w+)\)/);
                     return tz && tz[1] || '';