feat(rules): add rules for validation custom DateFormats

app/Rules/DateYMD.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Rules;
+
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+/**
+ * Validate a date in the format YYYY-MM-DD.
+ */
+class DateYMD implements ValidationRule
+{
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $value)) {
+            $fail('validation.format.date_ymd');
+        }
+        if (\DateTimeImmutable::createFromFormat("Y-m-d", $value) === false) {
+            $fail('validation.format.date_ymd');
+        }
+    }
+}