convert timesheets to UTC with support for user timezone (#372)

src/Doctrine/UTCDateTimeType.php

@@ -0,0 +1,74 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Doctrine;
+
+use Doctrine\DBAL\Platforms\AbstractPlatform;
+use Doctrine\DBAL\Types\ConversionException;
+use Doctrine\DBAL\Types\DateTimeType;
+
+class UTCDateTimeType extends DateTimeType
+{
+    /**
+     * @var \DateTimeZone
+     */
+    private static $utc;
+
+    /**
+     * @param mixed $value
+     * @param AbstractPlatform $platform
+     * @return mixed|string
+     * @throws ConversionException
+     */
+    public function convertToDatabaseValue($value, AbstractPlatform $platform)
+    {
+        if ($value instanceof \DateTime) {
+            $value->setTimezone(self::getUtc());
+        }
+
+        return parent::convertToDatabaseValue($value, $platform);
+    }
+
+    /**
+     * @return \DateTimeZone
+     */
+    public static function getUtc()
+    {
+        return self::$utc ? self::$utc : self::$utc = new \DateTimeZone('UTC');
+    }
+
+    /**
+     * @param mixed $value
+     * @param AbstractPlatform $platform
+     * @return bool|\DateTime|false|mixed
+     * @throws ConversionException
+     */
+    public function convertToPHPValue($value, AbstractPlatform $platform)
+    {
+        if (null === $value || $value instanceof \DateTime) {
+            return $value;
+        }
+
+        $converted = \DateTime::createFromFormat(
+            $platform->getDateTimeFormatString(),
+            $value,
+            self::getUtc()
+        );
+
+        if (!$converted) {
+            throw ConversionException::conversionFailedFormat(
+                $value,
+                $this->getName(),
+                $platform->getDateTimeFormatString()
+            );
+        }
+
+        return $converted;
+    }
+}