import startOfWeek from "../startOfWeek/index.js"; import requiredArgs from "../_lib/requiredArgs/index.js"; /** * @name startOfISOWeek * @category ISO Week Helpers * @summary Return the start of an ISO week for the given date. * * @description * Return the start of an ISO week for the given date. * The result will be in the local timezone. * * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date * * @param {Date|Number} date - the original date * @returns {Date} the start of an ISO week * @throws {TypeError} 1 argument required * * @example * // The start of an ISO week for 2 September 2014 11:55:00: * const result = startOfISOWeek(new Date(2014, 8, 2, 11, 55, 0)) * //=> Mon Sep 01 2014 00:00:00 */ export default function startOfISOWeek(dirtyDate) { requiredArgs(1, arguments); return startOfWeek(dirtyDate, { weekStartsOn: 1 }); }