1 files changed, 10 insertions, 0 deletions
diff --git a/vendor/sabre/vobject/lib/TimeZoneUtil.php b/vendor/sabre/vobject/lib/TimeZoneUtil.php
index 2a95ae898..925183e8d 100644
--- a/vendor/sabre/vobject/lib/TimeZoneUtil.php
+++ b/vendor/sabre/vobject/lib/TimeZoneUtil.php
@@ -165,6 +165,16 @@ class TimeZoneUtil {
             return new \DateTimeZone(self::$map[$tzid]);
         }
 
+        // Some Microsoft products prefix the offset first, so let's strip that off
+        // and see if it is our tzid map.  We don't want to check for this first just
+        // in case there are overrides in our tzid map.
+        if (preg_match('/^\((UTC|GMT)(\+|\-)[\d]{2}\:[\d]{2}\) (.*)/', $tzid, $matches)) {
+            $tzidAlternate = $matches[3];
+            if (isset(self::$map[$tzidAlternate])) {
+                return new \DateTimeZone(self::$map[$tzidAlternate]);
+            }
+        }
+
         // Maybe the author was hyper-lazy and just included an offset. We
         // support it, but we aren't happy about it.
         if (preg_match('/^GMT(\+|-)([0-9]{4})$/', $tzid, $matches)) {