start a restructure

Behavioral/Strategy/DateComparator.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace DesignPatterns\Strategy;
+
+/**
+ * Class DateComparator
+ */
+class DateComparator implements ComparatorInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function compare($a, $b)
+    {
+        $aDate = strtotime($a['date']);
+        $bDate = strtotime($b['date']);
+
+        if ($aDate == $bDate) {
+            return 0;
+        } else {
+            return $aDate < $bDate ? -1 : 1;
+        }
+    }
+}