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"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;
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