From b07738814e37ac039715f04577b55bf43bbefb88 Mon Sep 17 00:00:00 2001
From: danieljankowski <daniel.jankowski@rub.de>
Date: Tue, 4 May 2021 11:02:29 +0200
Subject: [PATCH] ASN1: fix timezone issue when non-utc time is given

---
 phpseclib/File/ASN1.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/phpseclib/File/ASN1.php b/phpseclib/File/ASN1.php
index 1419c097..a9f20e05 100644
--- a/phpseclib/File/ASN1.php
+++ b/phpseclib/File/ASN1.php
@@ -1093,7 +1093,10 @@ class File_ASN1
                 if (!class_exists('DateTime')) {
                     $value = @gmdate($format, strtotime($source)) . 'Z';
                 } else {
+                    // if $source does _not_ include timezone information within it then assume that the timezone is GMT
                     $date = new DateTime($source, new DateTimeZone('GMT'));
+                    // if $source _does_ include timezone information within it then convert the time to GMT
+                    $date->setTimezone(new DateTimeZone('GMT'));
                     $value = $date->format($format) . 'Z';
                 }
                 break;