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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;
}