47 lines
2.7 KiB
JavaScript
47 lines
2.7 KiB
JavaScript
import { getDefaultOptions } from "../_lib/defaultOptions/index.js";
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import getDate from "../getDate/index.js";
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import getDay from "../getDay/index.js";
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import startOfMonth from "../startOfMonth/index.js";
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import requiredArgs from "../_lib/requiredArgs/index.js";
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import toInteger from "../_lib/toInteger/index.js";
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/**
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* @name getWeekOfMonth
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* @category Week Helpers
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* @summary Get the week of the month of the given date.
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*
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* @description
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* Get the week of the month of the given date.
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*
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* @param {Date|Number} date - the given date
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* @param {Object} [options] - an object with options.
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* @param {Locale} [options.locale=defaultLocale] - the locale object. See [Locale]{@link https://date-fns.org/docs/Locale}
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* @param {0|1|2|3|4|5|6} [options.weekStartsOn=0] - the index of the first day of the week (0 - Sunday)
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* @returns {Number} the week of month
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* @throws {TypeError} 1 argument required
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* @throws {RangeError} `options.weekStartsOn` must be between 0 and 6 inclusively
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*
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* @example
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* // Which week of the month is 9 November 2017?
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* const result = getWeekOfMonth(new Date(2017, 10, 9))
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* //=> 2
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*/
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export default function getWeekOfMonth(date, options) {
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var _ref, _ref2, _ref3, _options$weekStartsOn, _options$locale, _options$locale$optio, _defaultOptions$local, _defaultOptions$local2;
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requiredArgs(1, arguments);
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var defaultOptions = getDefaultOptions();
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var weekStartsOn = toInteger((_ref = (_ref2 = (_ref3 = (_options$weekStartsOn = options === null || options === void 0 ? void 0 : options.weekStartsOn) !== null && _options$weekStartsOn !== void 0 ? _options$weekStartsOn : options === null || options === void 0 ? void 0 : (_options$locale = options.locale) === null || _options$locale === void 0 ? void 0 : (_options$locale$optio = _options$locale.options) === null || _options$locale$optio === void 0 ? void 0 : _options$locale$optio.weekStartsOn) !== null && _ref3 !== void 0 ? _ref3 : defaultOptions.weekStartsOn) !== null && _ref2 !== void 0 ? _ref2 : (_defaultOptions$local = defaultOptions.locale) === null || _defaultOptions$local === void 0 ? void 0 : (_defaultOptions$local2 = _defaultOptions$local.options) === null || _defaultOptions$local2 === void 0 ? void 0 : _defaultOptions$local2.weekStartsOn) !== null && _ref !== void 0 ? _ref : 0);
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if (!(weekStartsOn >= 0 && weekStartsOn <= 6)) {
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throw new RangeError('weekStartsOn must be between 0 and 6 inclusively');
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}
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var currentDayOfMonth = getDate(date);
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if (isNaN(currentDayOfMonth)) return NaN;
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var startWeekDay = getDay(startOfMonth(date));
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var lastDayOfFirstWeek = weekStartsOn - startWeekDay;
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if (lastDayOfFirstWeek <= 0) lastDayOfFirstWeek += 7;
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var remainingDaysAfterFirstWeek = currentDayOfMonth - lastDayOfFirstWeek;
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return Math.ceil(remainingDaysAfterFirstWeek / 7) + 1;
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} |