Index: src/webapp/api/scripts/labellers.js
===================================================================
--- src/webapp/api/scripts/labellers.js	(revision 1728)
+++ src/webapp/api/scripts/labellers.js	(working copy)
@@ -70,6 +70,7 @@
         } // else, fall through
     case SimileAjax.DateTime.YEAR:
     case SimileAjax.DateTime.DECADE:
+    case SimileAjax.DateTime.QUARTER_CENTURY:
     case SimileAjax.DateTime.CENTURY:
     case SimileAjax.DateTime.MILLENNIUM:
         var y = date.getUTCFullYear();