Add isBeforeDate, isAfterDate, isSameDate

snippets/isSameDate.md

@@ -0,0 +1,13 @@
+### isSameDate
+
+Check if a date is the same as another date.
+
+Use strict equality checking (`===`) to check if the first date is the same as the second one.
+
+```js
+const isSameDate = (dateA, dateB) => dateA === dateB;
+```
+
+```js
+isSameDate(new Date(2010, 10, 20), new Date(2010, 10, 20)); // true
+```