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Diffstat (limited to 'node_modules/date-fns/differenceInMonths/index.js')
| -rw-r--r-- | node_modules/date-fns/differenceInMonths/index.js | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/node_modules/date-fns/differenceInMonths/index.js b/node_modules/date-fns/differenceInMonths/index.js new file mode 100644 index 0000000..1422900 --- /dev/null +++ b/node_modules/date-fns/differenceInMonths/index.js @@ -0,0 +1,64 @@ +"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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