text: import differenceInDays from '../differenceInDays/index'
  import requiredArgs from '../_lib/requiredArgs/index'
  
  /**
   * @name differenceInWeeks
   * @category Week Helpers
   * @summary Get the number of full weeks between the given dates.
   *
   * @description
   * Get the number of full weeks between two dates. Fractional weeks are
   * truncated towards zero.
   *
   * One "full week" is the distance between a local time in one day to the same
   * local time 7 days earlier or later. A full week can sometimes be less than
   * or more than 7*24 hours if a daylight savings change happens between two dates.
   *
   * To ignore DST and only measure exact 7*24-hour periods, use this instead:
   * `Math.floor(differenceInHours(dateLeft, dateRight)/(7*24))|0`.
   *
   *
   * ### 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} dateLeft - the later date
   * @param {Date|Number} dateRight - the earlier date
   * @returns {Number} the number of full weeks
   * @throws {TypeError} 2 arguments required
   *
   * @example
   * // How many full weeks are between 5 July 2014 and 20 July 2014?
   * var result = differenceInWeeks(new Date(2014, 6, 20), new Date(2014, 6, 5))
   * //=> 2
   *
   * // How many full weeks are between
   * // 1 March 2020 0:00 and 6 June 2020 0:00 ?
   * // Note: because local time is used, the
   * // result will always be 8 weeks (54 days),
   * // even if DST starts and the period has
   * // only 54*24-1 hours.
   * var result = differenceInWeeks(
   *   new Date(2020, 5, 1),
   *   new Date(2020, 2, 6)
   * )
   * //=> 8
   */
  export default function differenceInWeeks(dirtyDateLeft, dirtyDateRight) {
    requiredArgs(2, arguments)
  
    var diff = differenceInDays(dirtyDateLeft, dirtyDateRight) / 7
    return diff > 0 ? Math.floor(diff) : Math.ceil(diff)
  }
  