diff --git a/src/core/2.base.js b/src/core/2.base.js
index d7007de52..63ff1821d 100644
--- a/src/core/2.base.js
+++ b/src/core/2.base.js
@@ -1079,7 +1079,7 @@
                     case "%b":
                     case "%B":
                         for (j = 0; j < 12; ++j) {
-                            if (BI.Date._MN[j].substr(0, a[i].length).toLowerCase() == a[i].toLowerCase()) {
+                            if (BI.getMonthName(j).substr(0, a[i].length).toLowerCase() == a[i].toLowerCase()) {
                                 m = j;
                                 break;
                             }
@@ -1144,7 +1144,7 @@
                 if (a[i].search(/[a-zA-Z]+/) != -1) {
                     var t = -1;
                     for (j = 0; j < 12; ++j) {
-                        if (BI.Date._MN[j].substr(0, a[i].length).toLowerCase() == a[i].toLowerCase()) {
+                        if (BI.getMonthName(j).substr(0, a[i].length).toLowerCase() == a[i].toLowerCase()) {
                             t = j;
                             break;
                         }
diff --git a/src/core/func/alias.js b/src/core/func/alias.js
index 0dca26ca6..2884e492b 100644
--- a/src/core/func/alias.js
+++ b/src/core/func/alias.js
@@ -815,7 +815,7 @@
                     break;
                 case "M": // 月
                     if (len > 2) {
-                        str = BI.Date._MN[date.getMonth()];
+                        str = BI.getMonthName(date.getMonth());
                     } else if (len < 2) {
                         str = date.getMonth() + 1;
                     } else {