Added a snippet isDateValid (#1415)

Co-authored-by: Isabelle Viktoria Maciohsek <maciv@hotmail.gr>

snippets/isDateValid.md

@@ -0,0 +1,23 @@
+---
+title: isDateValid
+tags: date,intermediate
+---
+
+Returns `true` if a valid date object can be created from the given values, `false` otherwise.
+
+- Use the spread operator (`...`) to pass the array of arguments to the `Date` constructor.
+- Use `Date.prototype.valueOf()` and `Number.isNaN()` to check if a valid `Date` object can be created from the given values.
+
+```js
+const isDateValid = (...val) => !isNaN(new Date(...val).valueOf());
+```
+
+```js
+isDateValid('December 17, 1995 03:24:00'); // true
+isDateValid('1995-12-17T03:24:00'); // true
+isDateValid('1995-12-17 T03:24:00'); // false
+isDateValid('Duck'); // false
+isDateValid(1995, 11, 17); // true
+isDateValid(1995, 11, 17, 'Duck'); // false
+isDateValid({}); // false
+```