71 lines
2.6 KiB
JavaScript
71 lines
2.6 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = differenceInMonths;
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var _index = _interopRequireDefault(require("../toDate/index.js"));
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var _index2 = _interopRequireDefault(require("../differenceInCalendarMonths/index.js"));
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var _index3 = _interopRequireDefault(require("../compareAsc/index.js"));
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var _index4 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
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var _index5 = _interopRequireDefault(require("../isLastDayOfMonth/index.js"));
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* @name differenceInMonths
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* @category Month Helpers
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* @summary Get the number of full months between the given dates.
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*
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* @description
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* Get the number of full months between the given dates using trunc as a default rounding method.
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*
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* @param {Date|Number} dateLeft - the later date
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* @param {Date|Number} dateRight - the earlier date
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* @returns {Number} the number of full months
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* @throws {TypeError} 2 arguments required
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*
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* @example
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* // How many full months are between 31 January 2014 and 1 September 2014?
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* const result = differenceInMonths(new Date(2014, 8, 1), new Date(2014, 0, 31))
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* //=> 7
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*/
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function differenceInMonths(dirtyDateLeft, dirtyDateRight) {
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(0, _index4.default)(2, arguments);
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var dateLeft = (0, _index.default)(dirtyDateLeft);
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var dateRight = (0, _index.default)(dirtyDateRight);
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var sign = (0, _index3.default)(dateLeft, dateRight);
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var difference = Math.abs((0, _index2.default)(dateLeft, dateRight));
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var result; // Check for the difference of less than month
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if (difference < 1) {
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result = 0;
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} else {
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if (dateLeft.getMonth() === 1 && dateLeft.getDate() > 27) {
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// This will check if the date is end of Feb and assign a higher end of month date
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// to compare it with Jan
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dateLeft.setDate(30);
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}
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dateLeft.setMonth(dateLeft.getMonth() - sign * difference); // Math.abs(diff in full months - diff in calendar months) === 1 if last calendar month is not full
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// If so, result must be decreased by 1 in absolute value
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var isLastMonthNotFull = (0, _index3.default)(dateLeft, dateRight) === -sign; // Check for cases of one full calendar month
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if ((0, _index5.default)((0, _index.default)(dirtyDateLeft)) && difference === 1 && (0, _index3.default)(dirtyDateLeft, dateRight) === 1) {
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isLastMonthNotFull = false;
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}
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result = sign * (difference - Number(isLastMonthNotFull));
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} // Prevent negative zero
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return result === 0 ? 0 : result;
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}
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module.exports = exports.default;
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