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40 lines
1.6 KiB
40 lines
1.6 KiB
3 years ago
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import differenceInCalendarWeeks from '../differenceInCalendarWeeks/index.js';
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import lastDayOfMonth from '../lastDayOfMonth/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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/**
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* @name getWeeksInMonth
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* @category Week Helpers
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* @summary Get the number of calendar weeks a month spans.
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*
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* @description
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* Get the number of calendar weeks the month in the given date spans.
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*
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* ### v2.0.0 breaking changes:
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*
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* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
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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 number of calendar weeks
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* @throws {TypeError} 2 arguments required
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* @throws {RangeError} `options.weekStartsOn` must be between 0 and 6
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*
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* @example
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* // How many calendar weeks does February 2015 span?
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* var result = getWeeksInMonth(new Date(2015, 1, 8))
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* //=> 4
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*
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* @example
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* // If the week starts on Monday,
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* // how many calendar weeks does July 2017 span?
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* var result = getWeeksInMonth(new Date(2017, 6, 5), { weekStartsOn: 1 })
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* //=> 6
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*/
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export default function getWeeksInMonth(date, options) {
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requiredArgs(1, arguments);
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return differenceInCalendarWeeks(lastDayOfMonth(date), startOfMonth(date), options) + 1;
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}
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