diff --git a/src/case/calendar/calendar.js b/src/case/calendar/calendar.js
index 0a9d40e05..5645fb1f5 100644
--- a/src/case/calendar/calendar.js
+++ b/src/case/calendar/calendar.js
@@ -170,7 +170,7 @@ BI.Calendar = BI.inherit(BI.Widget, {
                     forceSelected: true,
                     value: year + "-" + month + "-" + td.text,
                     disabled: td.disabled,
-                    cls: td.lastMonth || td.nextMonth ? "not-current-month-day" : "",
+                    cls: td.lastMonth || td.nextMonth ? "bi-tips" : "",
                     lgap: 2,
                     rgap: 2,
                     tgap: 4,
diff --git a/src/less/case/calendar/calendar.less b/src/less/case/calendar/calendar.less
deleted file mode 100644
index 388bcf9e3..000000000
--- a/src/less/case/calendar/calendar.less
+++ /dev/null
@@ -1,5 +0,0 @@
-@import "../../index.less";
-
-.bi-calendar-date-item.not-current-month-day {
-    color: @color-bi-text-disabled-button !important;
-}
\ No newline at end of file