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backend/node_modules/date-fns/addMonths/index.js

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+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = addMonths;
+var _index = _interopRequireDefault(require("../_lib/toInteger/index.js"));
+var _index2 = _interopRequireDefault(require("../toDate/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name addMonths
+ * @category Month Helpers
+ * @summary Add the specified number of months to the given date.
+ *
+ * @description
+ * Add the specified number of months to the given date.
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} amount - the amount of months to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ * @returns {Date} the new date with the months added
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Add 5 months to 1 September 2014:
+ * const result = addMonths(new Date(2014, 8, 1), 5)
+ * //=> Sun Feb 01 2015 00:00:00
+ */
+function addMonths(dirtyDate, dirtyAmount) {
+  (0, _index3.default)(2, arguments);
+  var date = (0, _index2.default)(dirtyDate);
+  var amount = (0, _index.default)(dirtyAmount);
+  if (isNaN(amount)) {
+    return new Date(NaN);
+  }
+  if (!amount) {
+    // If 0 months, no-op to avoid changing times in the hour before end of DST
+    return date;
+  }
+  var dayOfMonth = date.getDate();
+
+  // The JS Date object supports date math by accepting out-of-bounds values for
+  // month, day, etc. For example, new Date(2020, 0, 0) returns 31 Dec 2019 and
+  // new Date(2020, 13, 1) returns 1 Feb 2021.  This is *almost* the behavior we
+  // want except that dates will wrap around the end of a month, meaning that
+  // new Date(2020, 13, 31) will return 3 Mar 2021 not 28 Feb 2021 as desired. So
+  // we'll default to the end of the desired month by adding 1 to the desired
+  // month and using a date of 0 to back up one day to the end of the desired
+  // month.
+  var endOfDesiredMonth = new Date(date.getTime());
+  endOfDesiredMonth.setMonth(date.getMonth() + amount + 1, 0);
+  var daysInMonth = endOfDesiredMonth.getDate();
+  if (dayOfMonth >= daysInMonth) {
+    // If we're already at the end of the month, then this is the correct date
+    // and we're done.
+    return endOfDesiredMonth;
+  } else {
+    // Otherwise, we now know that setting the original day-of-month value won't
+    // cause an overflow, so set the desired day-of-month. Note that we can't
+    // just set the date of `endOfDesiredMonth` because that object may have had
+    // its time changed in the unusual case where where a DST transition was on
+    // the last day of the month and its local time was in the hour skipped or
+    // repeated next to a DST transition.  So we use `date` instead which is
+    // guaranteed to still have the original time.
+    date.setFullYear(endOfDesiredMonth.getFullYear(), endOfDesiredMonth.getMonth(), dayOfMonth);
+    return date;
+  }
+}
+module.exports = exports.default;