My first commit of codes

vendor/mtdowling/cron-expression/src/Cron/HoursField.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Cron;
+
+/**
+ * Hours field.  Allows: * , / -
+ */
+class HoursField extends AbstractField
+{
+    public function isSatisfiedBy(\DateTime $date, $value)
+    {
+        return $this->isSatisfied($date->format('H'), $value);
+    }
+
+    public function increment(\DateTime $date, $invert = false)
+    {
+        // Change timezone to UTC temporarily. This will
+        // allow us to go back or forwards and hour even
+        // if DST will be changed between the hours.
+        $timezone = $date->getTimezone();
+        $date->setTimezone(new \DateTimeZone('UTC'));
+        if ($invert) {
+            $date->modify('-1 hour');
+            $date->setTime($date->format('H'), 59);
+        } else {
+            $date->modify('+1 hour');
+            $date->setTime($date->format('H'), 0);
+        }
+        $date->setTimezone($timezone);
+
+        return $this;
+    }
+
+    public function validate($value)
+    {
+        return (bool) preg_match('/^[\*,\/\-0-9]+$/', $value);
+    }
+}