diff --git a/bi/core.js b/bi/core.js
index d9254f202..d36ff77a3 100644
--- a/bi/core.js
+++ b/bi/core.js
@@ -6354,6 +6354,20 @@ Date.prototype.getQuarterStartMonth = function () {
     }
     return quarterStartMonth;
 };
+
+//指定日期n个月之前或之后的日期
+Date.prototype.getOffsetMonth = function (n) {
+    var dt = new Date(this.getTime());
+    var day = dt.getDate();
+    var monthDay = new Date(dt.getFullYear(), dt.getMonth() + parseInt(n), 1).getMonthDays();
+    if(day > monthDay){
+        day = monthDay;
+    }
+    dt.setDate(day);
+    dt.setMonth(dt.getMonth() + parseInt(n));
+    return dt;
+};
+
 //获得本季度的起始日期
 Date.prototype.getQuarterStartDate = function () {
     return new Date(this.getFullYear(), this.getQuarterStartMonth(), 1);
diff --git a/docs/core.js b/docs/core.js
index ca61c1ec3..dcd1f9474 100644
--- a/docs/core.js
+++ b/docs/core.js
@@ -23834,6 +23834,20 @@ Date.prototype.getQuarterStartMonth = function () {
     }
     return quarterStartMonth;
 };
+
+//指定日期n个月之前或之后的日期
+Date.prototype.getOffsetMonth = function (n) {
+    var dt = new Date(this.getTime());
+    var day = dt.getDate();
+    var monthDay = new Date(dt.getFullYear(), dt.getMonth() + parseInt(n), 1).getMonthDays();
+    if(day > monthDay){
+        day = monthDay;
+    }
+    dt.setDate(day);
+    dt.setMonth(dt.getMonth() + parseInt(n));
+    return dt;
+};
+
 //获得本季度的起始日期
 Date.prototype.getQuarterStartDate = function () {
     return new Date(this.getFullYear(), this.getQuarterStartMonth(), 1);
diff --git a/src/core/proto/date.js b/src/core/proto/date.js
index 1ae8b5959..e3146708b 100644
--- a/src/core/proto/date.js
+++ b/src/core/proto/date.js
@@ -182,6 +182,20 @@ Date.prototype.getQuarterStartMonth = function () {
     }
     return quarterStartMonth;
 };
+
+//指定日期n个月之前或之后的日期
+Date.prototype.getOffsetMonth = function (n) {
+    var dt = new Date(this.getTime());
+    var day = dt.getDate();
+    var monthDay = new Date(dt.getFullYear(), dt.getMonth() + parseInt(n), 1).getMonthDays();
+    if(day > monthDay){
+        day = monthDay;
+    }
+    dt.setDate(day);
+    dt.setMonth(dt.getMonth() + parseInt(n));
+    return dt;
+};
+
 //获得本季度的起始日期
 Date.prototype.getQuarterStartDate = function () {
     return new Date(this.getFullYear(), this.getQuarterStartMonth(), 1);