From e418fcb6cac23711abca7863fb24ce86f16af0df Mon Sep 17 00:00:00 2001
From: Ludovic Marcotte <lmarcotte@inverse.ca>
Date: Thu, 20 Dec 2018 13:37:59 -0500
Subject: [PATCH] (fix) better handle timezone changes (fixes #4624)

---
 ActiveSync/iCalTimeZone+ActiveSync.m | 26 ++++++++++++++++++++++----
 NEWS                                 |  1 +
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/ActiveSync/iCalTimeZone+ActiveSync.m b/ActiveSync/iCalTimeZone+ActiveSync.m
index a1bc17003..6b2a911c9 100644
--- a/ActiveSync/iCalTimeZone+ActiveSync.m
+++ b/ActiveSync/iCalTimeZone+ActiveSync.m
@@ -78,10 +78,28 @@ struct SYSTEMTIME {
       tzData->wDay = ([mask firstOccurrence] == -1) ? 5 : [mask firstOccurrence];
 
       dateValue = [self startDate];
-      tzData->wHour = [dateValue hourOfDay];
-      tzData->wMinute = [dateValue minuteOfHour];
-      tzData->wSecond = [dateValue secondOfMinute];
-      tzData->wMilliseconds = 0;
+
+      if (![dateValue hourOfDay])
+        {
+          if ([mask firstDay]-1 < 0)
+            tzData->wDayOfWeek = 6;
+          else
+            tzData->wDayOfWeek = [mask firstDay]-1;
+
+          tzData->wHour = 23;
+          tzData->wMinute = 59;
+          tzData->wSecond = 59;
+          tzData->wMilliseconds = 999;
+        }
+      else
+       {
+          tzData->wDayOfWeek = [mask firstDay];
+
+          tzData->wHour = [dateValue hourOfDay];
+          tzData->wMinute = [dateValue minuteOfHour];
+          tzData->wSecond = [dateValue secondOfMinute];
+          tzData->wMilliseconds = 0;
+       }
     }
 }
 
diff --git a/NEWS b/NEWS
index 8eb476d09..cc1d7bc18 100644
--- a/NEWS
+++ b/NEWS
@@ -23,6 +23,7 @@ Bug fixes
  - [eas] improve search operations and results fetching
  - [eas] better handle bogus DTStart values
  - [eas] support for basic UserInformation queries (#4614)
+ - [eas] better handle timezone changes (#4624)
 
 4.0.4 (2018-10-23)
 ------------------