Upgrade to rc5

kirby/config/fields/mixins/datetime.php

@@ -0,0 +1,16 @@
+<?php
+
+return [
+    'methods' => [
+        'toDatetime' => function ($value, string $format = 'Y-m-d H:i:s') {
+            if ($timestamp = timestamp($value, $this->step)) {
+                return $this->toISO($timestamp, $format);
+            }
+
+            return null;
+        },
+        'toISO' => function (int $time, string $format = 'Y-m-d H:i:s') {
+            return date($format, $time);
+        }
+    ]
+];