Index: Source/web/typo3conf/ext/timer/Classes/ViewHelpers/Format/DateViewHelper.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- Source/web/typo3conf/ext/timer/Classes/ViewHelpers/Format/DateViewHelper.php	(revision 03affdb0480a9628d82f1c2ce81b4583346db4d2)
+++ Source/web/typo3conf/ext/timer/Classes/ViewHelpers/Format/DateViewHelper.php	(date 1604410248331)
@@ -116,6 +116,7 @@
     {
         $this->registerArgument('date', 'mixed', 'Either an object implementing DateTimeInterface or a string that is accepted by DateTime constructor');
         $this->registerArgument('format', 'string', 'Format String which is taken to format the Date/Time', false, '');
+        $this->registerArgument('zone', 'string', 'Timezone for the date, if it is different from the Timezone of TYPO3', false, '');
         $this->registerArgument('base', 'mixed', 'A base time (an object implementing DateTimeInterface or a string) used if $date is a relative date specification. Defaults to current time.');
     }
 
@@ -129,6 +130,15 @@
      */
     public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
     {
+        $zone = date_default_timezone_get();
+        if (isset($arguments['zone']) && (!empty($arguments['zone']))) {
+            $help = $arguments['zone'];
+            $zoneList = timezone_identifiers_list(); # list of (all) valid timezones
+            $zone = (in_array($help, $zoneList)?
+                $help:
+                date_default_timezone_get()
+            );
+        }
         $format = $arguments['format'];
         $base = $arguments['base'] ?? GeneralUtility::makeInstance(Context::class)->getPropertyFromAspect('date', 'timestamp');
         if (is_string($base)) {
@@ -157,11 +167,11 @@
                 $base = $base instanceof \DateTimeInterface ? $base->format('U') : strtotime((MathUtility::canBeInterpretedAsInteger($base) ? '@' : '') . $base);
                 $dateTimestamp = strtotime((MathUtility::canBeInterpretedAsInteger($date) ? '@' : '') . $date, $base);
                 $date = new \DateTime('@' . $dateTimestamp);
-                $date->setTimezone(new \DateTimeZone(date_default_timezone_get()));
             } catch (\Exception $exception) {
                 throw new Exception('"' . $date . '" could not be parsed by \DateTime constructor: ' . $exception->getMessage(), 1241722579);
             }
         }
+        $date->setTimezone(new \DateTimeZone($zone));
 
         if (strpos($format, '%') !== false) {
             return strftime($format, $date->format('U'));