From a5179f5d3eaf152d7d3b636047df8e058ef1c1a9 Mon Sep 17 00:00:00 2001
From: Andy Street <andy@street.me.uk>
Date: Sun, 15 Sep 2019 23:09:57 +0100
Subject: [PATCH] Bugfix: Timestamps not converted to UTC when writing GPX

---
 src/libgpx/gpxwriter.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libgpx/gpxwriter.php b/src/libgpx/gpxwriter.php
index 24b80b5..410bbe3 100644
--- a/src/libgpx/gpxwriter.php
+++ b/src/libgpx/gpxwriter.php
@@ -425,7 +425,7 @@ class GPXWriter
   ) {
     if ($millis === null)
       $millis = $this->milliseconds;
-    if (!$timestamp->getTimezone()->getOffset($timestamp))
+    if ($timestamp->getTimezone()->getOffset($timestamp) != 0)
       $timestamp = $timestamp->setTimezone(new DateTimeZone('UTC'));
     $format = 'Y-m-d\TH:i:s' . ($millis ? '.v\Z' : '\Z');
     return $timestamp->format($format);
-- 
2.39.5