diff --git a/src/core/2.base.js b/src/core/2.base.js
index d8b9bd6d4..8f05642be 100644
--- a/src/core/2.base.js
+++ b/src/core/2.base.js
@@ -1130,7 +1130,7 @@
                 m = today.getMonth();
             }
             if (isNaN(d)) {
-                d = today.getDate();
+                d = Math.min(BI.getMonthDays(BI.getDate(y, m)), today.getDate());
             }
             if (isNaN(hr)) {
                 hr = today.getHours();