From f6802992d212d05d16600e5419eed525506863ba Mon Sep 17 00:00:00 2001
From: Yi Yang <yi@newmode.net>
Date: Thu, 11 Mar 2021 15:05:33 -0800
Subject: [PATCH] #1539 fix timezone when it's DateTimeImmutable

---
 src/Monolog/Handler/SyslogUdpHandler.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/Monolog/Handler/SyslogUdpHandler.php b/src/Monolog/Handler/SyslogUdpHandler.php
index a31ae9a0..2bf3da69 100644
--- a/src/Monolog/Handler/SyslogUdpHandler.php
+++ b/src/Monolog/Handler/SyslogUdpHandler.php
@@ -97,9 +97,12 @@ class SyslogUdpHandler extends AbstractSyslogHandler
         }
 
         if ($this->rfc === self::RFC3164 && ($datetime instanceof \DateTimeImmutable || $datetime instanceof \DateTime)) {
-            $datetime->setTimezone(new \DateTimeZone('UTC'));
+            $dateNew = $datetime->setTimezone(new \DateTimeZone('UTC'));
+            $date = $dateNew->format($this->dateFormats[$this->rfc]);
+        }
+        else {
+            $date = $datetime->format($this->dateFormats[$this->rfc]);
         }
-        $date = $datetime->format($this->dateFormats[$this->rfc]);
 
         if ($this->rfc === self::RFC3164) {
             return "<$priority>" .