diff --git a/bi/case.js b/bi/case.js
index 163ac141da..039b4873e9 100644
--- a/bi/case.js
+++ b/bi/case.js
@@ -3596,6 +3596,14 @@ BI.BubbleCombo = BI.inherit(BI.Widget, {
 
     hasView: function () {
         return BI.isNotNull(this.combo.getView());
+    },
+
+    isViewVisible: function () {
+        return this.combo.isViewVisible();
+    },
+
+    setEnable: function (v) {
+        this.combo.setEnable(!!v);
     }
 });
 
diff --git a/bi/core.js b/bi/core.js
index 95228d4cf6..af4d547e47 100644
--- a/bi/core.js
+++ b/bi/core.js
@@ -6338,8 +6338,9 @@ Date.checkLegal = function (str) {
     if (ar.length <= 2) {
         return MM >= 1 && MM <= 12;
     }
-    Date._MD[1] = Date.isLeap(YY) ? 29 : 28;
-    return MM >= 1 && MM <= 12 && DD <= Date._MD[MM - 1];
+    var MD = Date._MD.slice(0);
+    MD[1] = Date.isLeap(YY) ? 29 : 28;
+    return MM >= 1 && MM <= 12 && DD <= MD[MM - 1];
 };
 
 Date.parseDateTime = function (str, fmt) {
diff --git a/docs/case.js b/docs/case.js
index 163ac141da..039b4873e9 100644
--- a/docs/case.js
+++ b/docs/case.js
@@ -3596,6 +3596,14 @@ BI.BubbleCombo = BI.inherit(BI.Widget, {
 
     hasView: function () {
         return BI.isNotNull(this.combo.getView());
+    },
+
+    isViewVisible: function () {
+        return this.combo.isViewVisible();
+    },
+
+    setEnable: function (v) {
+        this.combo.setEnable(!!v);
     }
 });
 
diff --git a/docs/core.js b/docs/core.js
index 39cd1299ff..e1ec3a400f 100644
--- a/docs/core.js
+++ b/docs/core.js
@@ -23821,8 +23821,9 @@ Date.checkLegal = function (str) {
     if (ar.length <= 2) {
         return MM >= 1 && MM <= 12;
     }
-    Date._MD[1] = Date.isLeap(YY) ? 29 : 28;
-    return MM >= 1 && MM <= 12 && DD <= Date._MD[MM - 1];
+    var MD = Date._MD.slice(0);
+    MD[1] = Date.isLeap(YY) ? 29 : 28;
+    return MM >= 1 && MM <= 12 && DD <= MD[MM - 1];
 };
 
 Date.parseDateTime = function (str, fmt) {
diff --git a/src/case/combo/bubblecombo/combo.bubble.js b/src/case/combo/bubblecombo/combo.bubble.js
index 7da74e5caf..023872a577 100644
--- a/src/case/combo/bubblecombo/combo.bubble.js
+++ b/src/case/combo/bubblecombo/combo.bubble.js
@@ -197,6 +197,14 @@ BI.BubbleCombo = BI.inherit(BI.Widget, {
 
     hasView: function () {
         return BI.isNotNull(this.combo.getView());
+    },
+
+    isViewVisible: function () {
+        return this.combo.isViewVisible();
+    },
+
+    setEnable: function (v) {
+        this.combo.setEnable(!!v);
     }
 });
 
diff --git a/src/core/proto/date.js b/src/core/proto/date.js
index 36197df932..75e833c6a4 100644
--- a/src/core/proto/date.js
+++ b/src/core/proto/date.js
@@ -386,8 +386,9 @@ Date.checkLegal = function (str) {
     if (ar.length <= 2) {
         return MM >= 1 && MM <= 12;
     }
-    Date._MD[1] = Date.isLeap(YY) ? 29 : 28;
-    return MM >= 1 && MM <= 12 && DD <= Date._MD[MM - 1];
+    var MD = Date._MD.slice(0);
+    MD[1] = Date.isLeap(YY) ? 29 : 28;
+    return MM >= 1 && MM <= 12 && DD <= MD[MM - 1];
 };
 
 Date.parseDateTime = function (str, fmt) {