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+---
+title: countWeekDaysBetween
+tags: date,array,intermediate
+---
+
+Returns the weekday count between two dates.
+
+- Use `Array.from()` to construct an array with `length` equal to the number of days between `startDate` and `endDate`.
+- Use `Array.prototype.reduce()` to iterate over the array, checking if each date is a weekday and incrementing `count`.
+- Update `startDate` with the next day each loop using `Date.getDate()` and `Date.setDate()` to advance it by one day.
+
+```js
+const countWeekDaysBetween = (startDate, endDate) =>
+  Array
+    .from({ length: (endDate - startDate) / (1000 * 3600 * 24) })
+    .reduce(count => {
+      if (startDate.getDay() % 6 !== 0) count++;
+      startDate = new Date(startDate.setDate(startDate.getDate() + 1));
+      return count;
+    }, 0);
+```
+
+```js
+countWeekDaysBetween(new Date('Oct 05, 2020'), new Date('Oct 06, 2020')); // 1
+countWeekDaysBetween(new Date('Oct 05, 2020'), new Date('Oct 14, 2020')); // 7
+```