index.js
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import isValid from '../isValid/index.js';
import isWeekend from '../isWeekend/index.js';
import toDate from '../toDate/index.js';
import differenceInCalendarDays from '../differenceInCalendarDays/index.js';
import addDays from '../addDays/index.js';
import isSameDay from '../isSameDay/index.js';
import toInteger from '../_lib/toInteger/index.js';
import requiredArgs from '../_lib/requiredArgs/index.js';
/**
* @name differenceInBusinessDays
* @category Day Helpers
* @summary Get the number of business days between the given dates.
*
* @description
* Get the number of business day periods between the given dates.
* Business days being days that arent in the weekend.
* Like `differenceInCalendarDays`, the function removes the times from
* the dates before calculating the difference.
*
* @param {Date|Number} dateLeft - the later date
* @param {Date|Number} dateRight - the earlier date
* @returns {Number} the number of business days
* @throws {TypeError} 2 arguments required
*
* @example
* // How many business days are between
* // 10 January 2014 and 20 July 2014?
* var result = differenceInBusinessDays(
* new Date(2014, 6, 20),
* new Date(2014, 0, 10)
* )
* //=> 136
*/
export default function differenceInBusinessDays(dirtyDateLeft, dirtyDateRight) {
requiredArgs(2, arguments);
var dateLeft = toDate(dirtyDateLeft);
var dateRight = toDate(dirtyDateRight);
if (!isValid(dateLeft) || !isValid(dateRight)) return new Date(NaN);
var calendarDifference = differenceInCalendarDays(dateLeft, dateRight);
var sign = calendarDifference < 0 ? -1 : 1;
var weeks = toInteger(calendarDifference / 7);
var result = weeks * 5;
dateRight = addDays(dateRight, weeks * 7); // the loop below will run at most 6 times to account for the remaining days that don't makeup a full week
while (!isSameDay(dateLeft, dateRight)) {
// sign is used to account for both negative and positive differences
result += isWeekend(dateRight) ? 0 : sign;
dateRight = addDays(dateRight, sign);
}
return result === 0 ? 0 : result;
}