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javascript/snippets/add-week-days.md

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+---
+title: Add weekdays to date
+type: snippet
+tags: [date]
+cover: digital-nomad-9
+dateModified: 2021-01-08T00:23:44+02:00
+---
+
+Calculates the date after adding the given number of business days.
+
+- Use `Array.from()` to construct an array with `length` equal to the `count` of business days to be added.
+- Use `Array.prototype.reduce()` to iterate over the array, starting from `startDate` and incrementing, using `Date.prototype.getDate()` and `Date.prototype.setDate()`.
+- If the current `date` is on a weekend, update it again by adding either one day or two days to make it a weekday.
+- **NOTE:** Does not take official holidays into account.
+
+```js
+const addWeekDays = (startDate, count) =>
+  Array.from({ length: count }).reduce(date => {
+    date = new Date(date.setDate(date.getDate() + 1));
+    if (date.getDay() % 6 === 0)
+      date = new Date(date.setDate(date.getDate() + (date.getDay() / 6 + 1)));
+    return date;
+  }, startDate);
+```
+
+```js
+addWeekDays(new Date('Oct 09, 2020'), 5); // 'Oct 16, 2020'
+addWeekDays(new Date('Oct 12, 2020'), 5); // 'Oct 19, 2020'
+```