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node_modules/date-fns/differenceInBusinessDays.mjs

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+import { addDays } from "./addDays.mjs";
+import { differenceInCalendarDays } from "./differenceInCalendarDays.mjs";
+import { isSameDay } from "./isSameDay.mjs";
+import { isValid } from "./isValid.mjs";
+import { isWeekend } from "./isWeekend.mjs";
+import { toDate } from "./toDate.mjs";
+
+/**
+ * @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.
+ *
+ * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
+ *
+ * @param dateLeft - The later date
+ * @param dateRight - The earlier date
+ *
+ * @returns The number of business days
+ *
+ * @example
+ * // How many business days are between
+ * // 10 January 2014 and 20 July 2014?
+ * const result = differenceInBusinessDays(
+ *   new Date(2014, 6, 20),
+ *   new Date(2014, 0, 10)
+ * )
+ * //=> 136
+ *
+ * // How many business days are between
+ * // 30 November 2021 and 1 November 2021?
+ * const result = differenceInBusinessDays(
+ *   new Date(2021, 10, 30),
+ *   new Date(2021, 10, 1)
+ * )
+ * //=> 21
+ *
+ * // How many business days are between
+ * // 1 November 2021 and 1 December 2021?
+ * const result = differenceInBusinessDays(
+ *   new Date(2021, 10, 1),
+ *   new Date(2021, 11, 1)
+ * )
+ * //=> -22
+ *
+ * // How many business days are between
+ * // 1 November 2021 and 1 November 2021 ?
+ * const result = differenceInBusinessDays(
+ *   new Date(2021, 10, 1),
+ *   new Date(2021, 10, 1)
+ * )
+ * //=> 0
+ */
+export function differenceInBusinessDays(dateLeft, dateRight) {
+  const _dateLeft = toDate(dateLeft);
+  let _dateRight = toDate(dateRight);
+
+  if (!isValid(_dateLeft) || !isValid(_dateRight)) return NaN;
+
+  const calendarDifference = differenceInCalendarDays(_dateLeft, _dateRight);
+  const sign = calendarDifference < 0 ? -1 : 1;
+
+  const weeks = Math.trunc(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);
+  }
+
+  // Prevent negative zero
+  return result === 0 ? 0 : result;
+}
+
+// Fallback for modularized imports:
+export default differenceInBusinessDays;