30 lines
1.1 KiB
Markdown
30 lines
1.1 KiB
Markdown
---
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title: countWeekDaysBetween
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tags: date,intermediate
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firstSeen: 2020-10-11T11:44:44+03:00
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lastUpdated: 2020-10-20T11:21:07+03:00
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---
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Counts the weekdays between two dates.
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- Use `Array.from()` to construct an array with `length` equal to the number of days between `startDate` and `endDate`.
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- Use `Array.prototype.reduce()` to iterate over the array, checking if each date is a weekday and incrementing `count`.
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- Update `startDate` with the next day each loop using `Date.prototype.getDate()` and `Date.prototype.setDate()` to advance it by one day.
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- **NOTE:** Does not take official holidays into account.
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```js
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const countWeekDaysBetween = (startDate, endDate) =>
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Array
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.from({ length: (endDate - startDate) / (1000 * 3600 * 24) })
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.reduce(count => {
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if (startDate.getDay() % 6 !== 0) count++;
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startDate = new Date(startDate.setDate(startDate.getDate() + 1));
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return count;
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}, 0);
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```
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```js
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countWeekDaysBetween(new Date('Oct 05, 2020'), new Date('Oct 06, 2020')); // 1
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countWeekDaysBetween(new Date('Oct 05, 2020'), new Date('Oct 14, 2020')); // 7
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```
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