29 lines
1.1 KiB
Markdown
29 lines
1.1 KiB
Markdown
---
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title: addWeekDays
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tags: date,intermediate
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firstSeen: 2020-10-11T16:51:39+03:00
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lastUpdated: 2021-01-08T00:23:44+02:00
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---
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Calculates the date after adding the given number of business days.
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- Use `Array.from()` to construct an array with `length` equal to the `count` of business days to be added.
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- Use `Array.prototype.reduce()` to iterate over the array, starting from `startDate` and incrementing, using `Date.prototype.getDate()` and `Date.prototype.setDate()`.
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- If the current `date` is on a weekend, update it again by adding either one day or two days to make it a weekday.
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- **NOTE:** Does not take official holidays into account.
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```js
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const addWeekDays = (startDate, count) =>
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Array.from({ length: count }).reduce(date => {
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date = new Date(date.setDate(date.getDate() + 1));
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if (date.getDay() % 6 === 0)
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date = new Date(date.setDate(date.getDate() + (date.getDay() / 6 + 1)));
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return date;
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}, startDate);
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```
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```js
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addWeekDays(new Date('Oct 09, 2020'), 5); // 'Oct 16, 2020'
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addWeekDays(new Date('Oct 12, 2020'), 5); // 'Oct 19, 2020'
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```
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