@jsbits/add-months/umd/index.js

Adds or subtracts N months to any JavaScript Date, local or UTC.

/*
  @jsbits/add-months
  @author aMarCruz
  @version 1.1.2 UMD+ES5
  @license MIT
*/
/* eslint-disable */
;(function(root, factory) {
  if (typeof define == 'function' && define.amd) {
    define([], factory)
  } else if (typeof module == 'object' && module.exports) {
    module.exports = factory()
  } else {
    ((root.$ || root.jQuery || {}).jsbits || root.jsbits || (root.jsbits={})).addMonths = factory()
  }
})(typeof self !== 'undefined' ? self : this, function () {
  "use strict";
  var addMonthsLoc = function (date, count) {
      var day = date.getDate();
      date.setMonth(date.getMonth() + count, day > 28 ? 28 : day);
      if (day > 28) {
          var month = date.getMonth();
          date.setDate(day);
          if (date.getMonth() !== month) {
              date.setDate(0);
          }
      }
      return date;
  };
  var addMonthsUTC = function (date, count) {
      var day = date.getUTCDate();
      date.setUTCMonth(date.getUTCMonth() + count, day > 28 ? 28 : day);
      if (day > 28) {
          var month = date.getUTCMonth();
          date.setUTCDate(day);
          if (date.getUTCMonth() !== month) {
              date.setUTCDate(0);
          }
      }
      return date;
  };
  var _toString = Object.prototype.toString;
  var toDate = function (src) {
      var type = _toString.call(src);
      return new Date(type === '[object Date]' || type === '[object Number]' ? +src : NaN);
  };
  var addMonths = function _addMonths(startdate, count, asUTC) {
      var date = toDate(startdate);
      count |= 0;
      if (!count || isNaN(date)) {
          return date;
      }
      return asUTC ? addMonthsUTC(date, count) : addMonthsLoc(date, count);
  };
  return addMonths;
});