Current File : /var/www/html/node_modules/date-fns/differenceInMonths/index.js
"use strict";
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"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
/**
* @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.
*
* ### v2.0.0 breaking changes:
*
* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
*
* @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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