import toDate from "../toDate/index.js"; import requiredArgs from "../_lib/requiredArgs/index.js"; /** * @name getISODay * @category Weekday Helpers * @summary Get the day of the ISO week of the given date. * * @description * Get the day of the ISO week of the given date, * which is 7 for Sunday, 1 for Monday etc. * * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date * * @param {Date|Number} date - the given date * @returns {Number} the day of ISO week * @throws {TypeError} 1 argument required * * @example * // Which day of the ISO week is 26 February 2012? * const result = getISODay(new Date(2012, 1, 26)) * //=> 7 */ export default function getISODay(dirtyDate) { requiredArgs(1, arguments); var date = toDate(dirtyDate); var day = date.getDay(); if (day === 0) { day = 7; } return day; }