Move custom libs to the source tree

libs/SimpleValidator/Validators/Date.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace SimpleValidator\Validators;
+
+use DateTime;
+
+class Date extends Base
+{
+    private $formats = array();
+
+    public function __construct($field, $error_message, array $formats)
+    {
+        parent::__construct($field, $error_message);
+        $this->formats = $formats;
+    }
+
+    public function execute(array $data)
+    {
+        if ($this->isFieldNotEmpty($data)) {
+            foreach ($this->formats as $format) {
+                if ($this->isValidDate($data[$this->field], $format)) {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        return true;
+    }
+
+    public function isValidDate($value, $format)
+    {
+        $date = DateTime::createFromFormat($format, $value);
+
+        if ($date !== false) {
+            $errors = DateTime::getLastErrors();
+            if ($errors['error_count'] === 0 && $errors['warning_count'] === 0) {
+                return $date->getTimestamp() > 0;
+            }
+        }
+
+        return false;
+    }
+}