Refrain from passing the timezone when calling date_create() with a timestamp

"The $timezone parameter and the current timezone are ignored when the $datetime
parameter [...] is a UNIX timestamp (e.g. @946684800)"

See https://www.php.net/manual/en/datetime.construct.php

Author: thekid

src/main/php/util/Date.class.php

@@ -47,7 +47,7 @@ public function __construct($in= null, TimeZone $timezone= null) {
 
       // Specially mark timestamps for parsing (we assume here that strings
       // containing only digits are timestamps)
-      $this->handle= date_create('@'.$in, timezone_open('UTC'));
+      $this->handle= date_create('@'.$in);
       date_timezone_set($this->handle, $timezone ? $timezone->getHandle() : timezone_open(date_default_timezone_get()));
     } else {
       try {