34 lines
1.2 KiB
JavaScript
34 lines
1.2 KiB
JavaScript
import toDate from "../toDate/index.js";
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import startOfISOWeek from "../startOfISOWeek/index.js";
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import startOfISOWeekYear from "../startOfISOWeekYear/index.js";
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import requiredArgs from "../_lib/requiredArgs/index.js";
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var MILLISECONDS_IN_WEEK = 604800000;
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/**
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* @name getISOWeek
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* @category ISO Week Helpers
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* @summary Get the ISO week of the given date.
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*
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* @description
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* Get the ISO week of the given date.
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*
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* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
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*
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* @param {Date|Number} date - the given date
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* @returns {Number} the ISO week
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* @throws {TypeError} 1 argument required
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*
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* @example
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* // Which week of the ISO-week numbering year is 2 January 2005?
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* const result = getISOWeek(new Date(2005, 0, 2))
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* //=> 53
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*/
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export default function getISOWeek(dirtyDate) {
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requiredArgs(1, arguments);
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var date = toDate(dirtyDate);
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var diff = startOfISOWeek(date).getTime() - startOfISOWeekYear(date).getTime(); // Round the number of days to the nearest integer
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// because the number of milliseconds in a week is not constant
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// (e.g. it's different in the week of the daylight saving time clock shift)
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return Math.round(diff / MILLISECONDS_IN_WEEK) + 1;
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} |