diff --git a/lib/index.js b/lib/index.js
index 4662d34..29c9d7e 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -79,7 +79,7 @@
         case 'A': return locale.days[d.getDay()];
         case 'a': return locale.shortDays[d.getDay()];
         case 'B': return locale.months[d.getMonth()];
-        case 'b': // fall through
+        case 'b': return locale.shortMonths[d.getMonth()];
         case 'C':
           var y = String(d.getFullYear());
           return y.slice(0,2);
@@ -90,7 +90,7 @@
         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': 
+        case 'j':
           var y=new Date(d.getFullYear(), 0, 1);
           var day = Math.ceil((d.getTime() - y.getTime()) / (1000*60*60*24));
           return day;
diff --git a/test/test.js b/test/test.js
index a05d26a..fe0b84a 100644
--- a/test/test.js
+++ b/test/test.js
@@ -41,12 +41,14 @@ assert.format('%A', 'Tuesday')
 assert.format('%a', 'Tue')
 assert.format('%B', 'June')
 assert.format('%b', 'Jun')
+assert.format('%C', '20')
 assert.format('%D', '06/07/11')
 assert.format('%d', '07')
 assert.format('%e', '7')
 assert.format('%F', '2011-06-07')
 assert.format('%H', null, '18')
 assert.format('%I', null, '06')
+assert.format('%j', null, '158')
 assert.format('%k', null, '18')
 assert.format('%L', '067')
 assert.format('%l', null, ' 6')