diff --git a/packages/fineui/src/core/2.base.js b/packages/fineui/src/core/2.base.js
index 3bbf2d00d..15502e37b 100644
--- a/packages/fineui/src/core/2.base.js
+++ b/packages/fineui/src/core/2.base.js
@@ -1367,7 +1367,7 @@ export function parseDateTime(str, fmt) {
         m = today.getMonth();
     }
     if (_global.isNaN(d)) {
-        d = Math.min(getMonthDays(getDate(y, m)), today.getDate());
+        d = 1;
     }
     if (_global.isNaN(hr)) {
         hr = today.getHours();