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Viewing file:     index.js (2.55 KB)      -rw-r--r--

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = differenceInMonths;
var _index = _interopRequireDefault(require("../toDate/index.js"));
var _index2 = _interopRequireDefault(require("../differenceInCalendarMonths/index.js"));
var _index3 = _interopRequireDefault(require("../compareAsc/index.js"));
var _index4 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
var _index5 = _interopRequireDefault(require("../isLastDayOfMonth/index.js"));
/**
 * @name differenceInMonths
 * @category Month Helpers
 * @summary Get the number of full months between the given dates.
 *
 * @description
 * Get the number of full months between the given dates using trunc as a default rounding method.
 *
 * @param {Date|Number} dateLeft - the later date
 * @param {Date|Number} dateRight - the earlier date
 * @returns {Number} the number of full months
 * @throws {TypeError} 2 arguments required
 *
 * @example
 * // How many full months are between 31 January 2014 and 1 September 2014?
 * const result = differenceInMonths(new Date(2014, 8, 1), new Date(2014, 0, 31))
 * //=> 7
 */
function differenceInMonths(dirtyDateLeft, dirtyDateRight) {
  (0, _index4.default)(2, arguments);
  var dateLeft = (0, _index.default)(dirtyDateLeft);
  var dateRight = (0, _index.default)(dirtyDateRight);
  var sign = (0, _index3.default)(dateLeft, dateRight);
  var difference = Math.abs((0, _index2.default)(dateLeft, dateRight));
  var result;

  // Check for the difference of less than month
  if (difference < 1) {
    result = 0;
  } else {
    if (dateLeft.getMonth() === 1 && dateLeft.getDate() > 27) {
      // This will check if the date is end of Feb and assign a higher end of month date
      // to compare it with Jan
      dateLeft.setDate(30);
    }
    dateLeft.setMonth(dateLeft.getMonth() - sign * difference);

    // Math.abs(diff in full months - diff in calendar months) === 1 if last calendar month is not full
    // If so, result must be decreased by 1 in absolute value
    var isLastMonthNotFull = (0, _index3.default)(dateLeft, dateRight) === -sign;

    // Check for cases of one full calendar month
    if ((0, _index5.default)((0, _index.default)(dirtyDateLeft)) && difference === 1 && (0, _index3.default)(dirtyDateLeft, dateRight) === 1) {
      isLastMonthNotFull = false;
    }
    result = sign * (difference - Number(isLastMonthNotFull));
  }

  // Prevent negative zero
  return result === 0 ? 0 : result;
}
module.exports = exports.default;