1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556
import differenceInDays from '../differenceInDays/index.ts'import requiredArgs from '../_lib/requiredArgs/index.ts'
/** * @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? * const 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. * const result = differenceInWeeks( *   new Date(2020, 5, 1), *   new Date(2020, 2, 6) * ) * //=> 8 */export default function differenceInWeeks(  dirtyDateLeft: Date | number,  dirtyDateRight: Date | number): number {  requiredArgs(2, arguments)
  const diff = differenceInDays(dirtyDateLeft, dirtyDateRight) / 7  return diff > 0 ? Math.floor(diff) : Math.ceil(diff)}