getMonthDay

bi/core.js

@@ -6579,8 +6579,9 @@ Date.checkLegal = function (str) {
     if (ar.length <= 2) {
         return MM >= 1 && MM <= 12;
     }
-    Date._MD[1] = Date.isLeap(YY) ? 29 : 28;
+    var MD = Date._MD.slice(0);
-    return MM >= 1 && MM <= 12 && DD <= Date._MD[MM - 1];
+    MD[1] = Date.isLeap(YY) ? 29 : 28;
+    return MM >= 1 && MM <= 12 && DD <= MD[MM - 1];
 };
 
 Date.parseDateTime = function (str, fmt) {

docs/core.js

@@ -24062,8 +24062,9 @@ Date.checkLegal = function (str) {
     if (ar.length <= 2) {
         return MM >= 1 && MM <= 12;
     }
-    Date._MD[1] = Date.isLeap(YY) ? 29 : 28;
+    var MD = Date._MD.slice(0);
-    return MM >= 1 && MM <= 12 && DD <= Date._MD[MM - 1];
+    MD[1] = Date.isLeap(YY) ? 29 : 28;
+    return MM >= 1 && MM <= 12 && DD <= MD[MM - 1];
 };
 
 Date.parseDateTime = function (str, fmt) {

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;
+    var MD = Date._MD.slice(0);
-    return MM >= 1 && MM <= 12 && DD <= Date._MD[MM - 1];
+    MD[1] = Date.isLeap(YY) ? 29 : 28;
+    return MM >= 1 && MM <= 12 && DD <= MD[MM - 1];
 };
 
 Date.parseDateTime = function (str, fmt) {