diff --git a/ActiveSync/SOGoMailObject+ActiveSync.m b/ActiveSync/SOGoMailObject+ActiveSync.m
index 9e3205721..4213e819e 100644
--- a/ActiveSync/SOGoMailObject+ActiveSync.m
+++ b/ActiveSync/SOGoMailObject+ActiveSync.m
@@ -36,6 +36,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #import <Foundation/NSString.h>
 #import <Foundation/NSCharacterSet.h>
 #import <Foundation/NSTimeZone.h>
+#import <Foundation/NSValue.h>
 
 #import <NGCards/iCalCalendar.h>
 #import <NGCards/iCalDateTime.h>
@@ -960,7 +961,7 @@ struct GlobalObjectId {
       if ([event startDate])
         [s appendFormat: @"<StartTime xmlns=\"Email:\">%@</StartTime>", [[event startDate] activeSyncRepresentationInContext: context]];
       
-      if ([event timeStampAsDate])
+      if ([event timeStampAsDate] && [[event timeStampAsDate] dayOfMonth] > 0 && [[event timeStampAsDate] monthOfYear] > 0)
         [s appendFormat: @"<DTStamp xmlns=\"Email:\">%@</DTStamp>", [[event timeStampAsDate] activeSyncRepresentationInContext: context]];
       else if ([event created])
         [s appendFormat: @"<DTStamp xmlns=\"Email:\">%@</DTStamp>", [[event created] activeSyncRepresentationInContext: context]];
diff --git a/NEWS b/NEWS
index 680b9db92..1766fa871 100644
--- a/NEWS
+++ b/NEWS
@@ -4,6 +4,7 @@
 Bug fixes
  - [eas] strip '<>' from bodyId and when forwarding mails
  - [eas] fix search on for Outlook application (#4605 and #4607)
+ - [eas] better handle bogus DTStart values
 
 4.0.1 (2018-07-10)
 ------------------