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diff --git a/date-fns/src/differenceInBusinessDays/index.ts b/date-fns/src/differenceInBusinessDays/index.ts
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+import isValid from '../isValid/index'
+import isWeekend from '../isWeekend/index'
+import toDate from '../toDate/index'
+import differenceInCalendarDays from '../differenceInCalendarDays/index'
+import addDays from '../addDays/index'
+import isSameDay from '../isSameDay/index'
+import toInteger from '../_lib/toInteger/index'
+import requiredArgs from '../_lib/requiredArgs/index'
+
+/**
+ * @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: Date | number,
+  dirtyDateRight: Date | number
+): number {
+  requiredArgs(2, arguments)
+
+  const dateLeft = toDate(dirtyDateLeft)
+  let dateRight = toDate(dirtyDateRight)
+
+  if (!isValid(dateLeft) || !isValid(dateRight)) return NaN
+
+  const calendarDifference = differenceInCalendarDays(dateLeft, dateRight)
+  const sign = calendarDifference < 0 ? -1 : 1
+
+  const weeks = toInteger(calendarDifference / 7)
+
+  let 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
+}