From 7b1679a30d61cefef27dca0f33904fd3b66f9c59 Mon Sep 17 00:00:00 2001
From: windy <1374721899@qq.com>
Date: Tue, 9 May 2017 11:19:57 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9C=88=E4=BB=BD=E5=81=8F=E7=A7=BB=E6=96=B9?=
 =?UTF-8?q?=E6=B3=95?=
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---
 bi/core.js             | 14 ++++++++++++++
 docs/core.js           | 14 ++++++++++++++
 src/core/proto/date.js | 14 ++++++++++++++
 3 files changed, 42 insertions(+)

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);