Add a 'due date' field and display the number of comments on the board

vendor/SimpleValidator/Validators/Date.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace SimpleValidator\Validators;
+
+use SimpleValidator\Base;
+
+class Date extends Base
+{
+    private $format;
+
+    public function __construct($field, $error_message, $format)
+    {
+        parent::__construct($field, $error_message);
+        $this->format = $format;
+    }
+
+    public function execute(array $data)
+    {
+        if (isset($data[$this->field]) && $data[$this->field] !== '') {
+
+            $date = \DateTime::createFromFormat($this->format, $data[$this->field]);
+
+            if ($date !== false) {
+                $errors = \DateTime::getLastErrors();
+                return $errors['error_count'] === 0 && $errors['warning_count'] === 0;
+            }
+
+            return false;
+        }
+
+        return true;
+    }
+}