import toDate from '../toDate/index.js'

/**
 * @name getDay
 * @category Weekday Helpers
 * @summary Get the day of the week of the given date.
 *
 * @description
 * Get the day of the week of the given date.
 *
 * ### v2.0.0 breaking changes:
 *
 * - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
 *
 * @param {Date|Number} date - the given date
 * @returns {Number} the day of week
 * @throws {TypeError} 1 argument required
 *
 * @example
 * // Which day of the week is 29 February 2012?
 * var result = getDay(new Date(2012, 1, 29))
 * //=> 3
 */
export default function getDay(dirtyDate) {
  if (arguments.length < 1) {
    throw new TypeError(
      '1 argument required, but only ' + arguments.length + ' present'
    )
  }

  var date = toDate(dirtyDate)
  var day = date.getDay()
  return day
}
