From 278460dd58edf9723f721a693552243d5f39e016 Mon Sep 17 00:00:00 2001
From: Aidan Saunders <aidan.saunders@squiffle.uk>
Date: Mon, 13 Nov 2017 13:11:12 +0000
Subject: [PATCH] Fix handling of 0 offset

---
 CRM/Utils/System/Base.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CRM/Utils/System/Base.php b/CRM/Utils/System/Base.php
index d3f8f060d0..ef47412542 100644
--- a/CRM/Utils/System/Base.php
+++ b/CRM/Utils/System/Base.php
@@ -725,6 +725,11 @@ abstract class CRM_Utils_System_Base {
       $dateTime = new DateTime("now", $tzObj);
       $tz = $tzObj->getOffset($dateTime);
 
+      if ($tz == 0) {
+        // CRM-21422
+        return '+00:00';
+      }
+
       if (empty($tz)) {
         return FALSE;
       }
-- 
2.25.1