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+import isWeekend from "../isWeekend/index.js";
+import toDate from "../toDate/index.js";
+import toInteger from "../_lib/toInteger/index.js";
+import requiredArgs from "../_lib/requiredArgs/index.js";
+import isSunday from "../isSunday/index.js";
+import isSaturday from "../isSaturday/index.js";
+/**
+ * @name addBusinessDays
+ * @category Day Helpers
+ * @summary Add the specified number of business days (mon - fri) to the given date.
+ *
+ * @description
+ * Add the specified number of business days (mon - fri) to the given date, ignoring weekends.
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} amount - the amount of business days to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
+ * @returns {Date} the new date with the business days added
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Add 10 business days to 1 September 2014:
+ * const result = addBusinessDays(new Date(2014, 8, 1), 10)
+ * //=> Mon Sep 15 2014 00:00:00 (skipped weekend days)
+ */
+export default function addBusinessDays(dirtyDate, dirtyAmount) {
+ requiredArgs(2, arguments);
+ var date = toDate(dirtyDate);
+ var startedOnWeekend = isWeekend(date);
+ var amount = toInteger(dirtyAmount);
+ if (isNaN(amount)) return new Date(NaN);
+ var hours = date.getHours();
+ var sign = amount < 0 ? -1 : 1;
+ var fullWeeks = toInteger(amount / 5);
+ date.setDate(date.getDate() + fullWeeks * 7);
+
+ // Get remaining days not part of a full week
+ var restDays = Math.abs(amount % 5);
+
+ // Loops over remaining days
+ while (restDays > 0) {
+ date.setDate(date.getDate() + sign);
+ if (!isWeekend(date)) restDays -= 1;
+ }
+
+ // If the date is a weekend day and we reduce a dividable of
+ // 5 from it, we land on a weekend date.
+ // To counter this, we add days accordingly to land on the next business day
+ if (startedOnWeekend && isWeekend(date) && amount !== 0) {
+ // If we're reducing days, we want to add days until we land on a weekday
+ // If we're adding days we want to reduce days until we land on a weekday
+ if (isSaturday(date)) date.setDate(date.getDate() + (sign < 0 ? 2 : -1));
+ if (isSunday(date)) date.setDate(date.getDate() + (sign < 0 ? 1 : -2));
+ }
+
+ // Restore hours to avoid DST lag
+ date.setHours(hours);
+ return date;
+} \ No newline at end of file
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