diff --git a/server/go/camlistored/ui/camli.js b/server/go/camlistored/ui/camli.js
index 6b5ec3ef2..f674a772b 100644
--- a/server/go/camlistored/ui/camli.js
+++ b/server/go/camlistored/ui/camli.js
@@ -45,7 +45,7 @@ function dateToRfc3339String(dateVal) {
         }
         return numStr;
     }
-    return dateVal.getUTCFullYear() + "-" + pad(dateVal.getUTCMonth(), 2) + "-" + pad(dateVal.getUTCDate(), 2) + "T" +
+    return dateVal.getUTCFullYear() + "-" + pad(dateVal.getUTCMonth() + 1, 2) + "-" + pad(dateVal.getUTCDate(), 2) + "T" +
            pad(dateVal.getUTCHours(), 2) + ":" + pad(dateVal.getUTCMinutes(), 2) + ":" + pad(dateVal.getUTCSeconds(), 2) + "Z";
 }