diff --git a/lib/index.js b/lib/index.js
index ff9f255..4662d34 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -80,6 +80,9 @@
         case 'a': return locale.shortDays[d.getDay()];
         case 'B': return locale.months[d.getMonth()];
         case 'b': // fall through
+        case 'C':
+          var y = String(d.getFullYear());
+          return y.slice(0,2);
         case 'h': return locale.shortMonths[d.getMonth()];
         case 'D': return _strftime(locale.formats.D || '%m/%d/%y', d, locale);
         case 'd': return pad(d.getDate());
@@ -87,6 +90,10 @@
         case 'F': return _strftime(locale.formats.F || '%Y-%m-%d', d, locale);
         case 'H': return pad(d.getHours());
         case 'I': return pad(hours12(d));
+        case 'j': 
+          var y=new Date(d.getFullYear(), 0, 1);
+          var day = Math.ceil((d.getTime() - y.getTime()) / (1000*60*60*24));
+          return day;
         case 'k': return pad(d.getHours(), ' ');
         case 'L': return pad(Math.floor(d.getTime() % 1000), 3);
         case 'l': return pad(hours12(d), ' ');
@@ -156,4 +163,4 @@
     return hour;
   }
 
-}());
\ No newline at end of file
+}());