71 lines
2.6 KiB
JavaScript
71 lines
2.6 KiB
JavaScript
"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.
|
|
*
|
|
* @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; |