diff --git a/config.js b/config.js
index 841979a..6a8d17f 100644
--- a/config.js
+++ b/config.js
@@ -26,6 +26,10 @@
  *                 sss    millisecond 000-999 (456)
  *                 T      literal 'T'
  *
+ *               Non-standard extension tokens (localized via i18n):
+ *                 DDD    weekday short name    (Mon., Tue., ...)
+ *                 MMM    month short name      (January, February, ...)
+ *
  *               Date-only forms:  YYYY,  YYYY-MM,  YYYY-MM-DD
  *               Date-time forms:   above + T + HH:mm,  HH:mm:ss,  HH:mm:ss.sss
  *               Any other character is a literal (incl. spaces, tabs, \n).
diff --git a/index.html b/index.html
index 7427d81..8a354c6 100644
--- a/index.html
+++ b/index.html
@@ -822,8 +822,15 @@ var effect = (VANTA.CLOUDS2 || VANTA.CLOUDS)({
             //   sss   millisecond 000-999  (456)
             //   T     literal 'T'
             // Any other character is a literal (including whitespace).
+            //
+            // Non-standard extension tokens (lookup in i18n dict):
+            //   DDD   weekday short name    (Mon., Tue., ...) from i18n
+            //   MMM   month short name      (January, February, ...) from i18n
             var result = '';
             var i = 0;
+            var weekdayKeys = ['Su.', 'Mo.', 'Tu.', 'We.', 'Th.', 'Fr.', 'Sa.'];
+            var monthKeys = ['January', 'February', 'March', 'April', 'May', 'June',
+                             'July', 'August', 'September', 'October', 'November', 'December'];
             while (i < format.length) {
                 var ch = format.charAt(i);
                 if (ch === 'Y' && format.substr(i, 4) === 'YYYY') {
@@ -832,9 +839,15 @@ var effect = (VANTA.CLOUDS2 || VANTA.CLOUDS)({
                 } else if (ch === 'Y') {
                     result += date.getFullYear();
                     i += 1;
+                } else if (ch === 'M' && format.substr(i, 3) === 'MMM') {
+                    result += t(monthKeys[date.getMonth()]);
+                    i += 3;
                 } else if (ch === 'M' && format.substr(i, 2) === 'MM') {
                     result += pad2(date.getMonth() + 1);
                     i += 2;
+                } else if (ch === 'D' && format.substr(i, 3) === 'DDD') {
+                    result += t(weekdayKeys[date.getDay()]);
+                    i += 3;
                 } else if (ch === 'D' && format.substr(i, 2) === 'DD') {
                     result += pad2(date.getDate());
                     i += 2;