Update and rename getMonthDays.md to daysInMonth.md

snippets/daysInMonth.md

@@ -0,0 +1,20 @@
+---
+title: daysInMonth
+tags: date,beginner
+firstSeen: 2021-06-13T05:00:00-04:00
+---
+
+Gets the number of days in the given `month` of the specified `year`.
+
+- Use the `new Date()` constructor to create a date from the given `year` and `month`.
+- Set the days parameter to `0` to get the last day of the previous month, as months are zero-indexed.
+- Use `Date.prototype.getDate()` to return the number of days in the given `month`. 
+
+```js
+const daysInMonth = (year, month) => new Date(year, month, 0).getDate();
+```
+
+```js
+daysInMonth(2020, 12)); // 31
+daysInMonth(2024, 2)); // 29
+```

snippets/getMonthDays.md

@@ -1,23 +0,0 @@
----
-title: getMonthDays
-tags: date,intermediate
----
-
-Get the number of days in the month according to the specified month.
-
-- Use `new Date(year, monthIndex, day)`, set the parameter day to `0` to get last day of the previous month.
-- Use `Date.prototype.getDate` to get the day of month. 
-
-```js
-const getMonthDays = (year, month) => {
-  const today = new Date();
-  
-  return new Date(year || today.getFullYear(), month || (today.getMonth() + 1), 0).getDate();
-};
-```
-
-```js
-getMonthDays(); // 30
-getMonthDays(2020, 2); // 29
-getMonthDays(2021, 2); // 28
-```