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diff -up openchange-openchange-2.3-VULCAN/libexchange2ical/exchange2ical_property.c.libical-3.0 openchange-openchange-2.3-VULCAN/libexchange2ical/exchange2ical_property.c
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--- openchange-openchange-2.3-VULCAN/libexchange2ical/exchange2ical_property.c.libical-3.0	2017-11-08 14:45:06.494302213 +0100
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+++ openchange-openchange-2.3-VULCAN/libexchange2ical/exchange2ical_property.c	2017-11-08 14:47:33.465300181 +0100
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@@ -515,7 +515,7 @@ void ical_property_EXDATE(struct exchang
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 				icalproperty_add_parameter(prop, tzid);
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 			} else {
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 				/*Get time from dtstart*/
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-				icaltime.is_utc = 1;
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+				icaltime.zone = icaltimezone_get_utc_timezone ();
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 				if (exchange2ical->apptEndWhole){
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 					dttime = get_icaltime_from_FILETIME_UTC(exchange2ical->apptStartWhole);
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 					icaltime.hour   = dttime.hour;
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diff -up openchange-openchange-2.3-VULCAN/libexchange2ical/exchange2ical_utils.c.libical-3.0 openchange-openchange-2.3-VULCAN/libexchange2ical/exchange2ical_utils.c
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--- openchange-openchange-2.3-VULCAN/libexchange2ical/exchange2ical_utils.c.libical-3.0	2017-11-08 14:45:43.123301706 +0100
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+++ openchange-openchange-2.3-VULCAN/libexchange2ical/exchange2ical_utils.c	2017-11-08 14:47:31.873300203 +0100
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@@ -241,10 +241,9 @@ struct icaltimetype get_icaltimetype_fro
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 	tt.minute = tm->tm_min;
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 	tt.second = tm->tm_sec;
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-	tt.is_utc      = 0;
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 	tt.is_date     = 0;
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 	tt.is_daylight = 0;
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-	tt.zone        = 0;
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+	tt.zone        = icaltimezone_get_utc_timezone ();
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 	return tt;
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 }
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@@ -254,7 +253,6 @@ struct icaltimetype get_icaltimetype_fro
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 	struct icaltimetype tt;
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 	tt = get_icaltimetype_from_tm(tm);
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-	tt.is_utc      = 1;
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 	return tt;
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 }
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@@ -270,10 +268,8 @@ struct icaltimetype get_icaldate_from_tm
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 	tt.minute = 0;
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 	tt.second = 0;
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-	tt.is_utc      = 1;
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 	tt.is_date     = 1;
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 	tt.is_daylight = 0;
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-	tt.zone        = NULL;
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 	return tt;
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 }
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@@ -313,7 +309,6 @@ struct icaltimetype get_icaltime_from_FI
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 	tt.minute = tm->tm_min;                                                
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 	tt.second = tm->tm_sec;
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 	tt.is_date = 0;
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-	tt.is_utc = 0;
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 	tt.is_daylight = 0;
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 	tt.zone = NULL;
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@@ -339,9 +334,8 @@ struct icaltimetype get_icaltime_from_FI
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 	tt.minute = tm->tm_min;                                                
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 	tt.second = tm->tm_sec;
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 	tt.is_date = 0;
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-	tt.is_utc = 1;
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 	tt.is_daylight = 0;
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-	tt.zone = NULL;
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+	tt.zone = icaltimezone_get_utc_timezone ();
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 	return tt;
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 }
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@@ -371,9 +365,8 @@ struct icaltimetype get_icaldate_from_FI
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 	tt.minute = 0;                                                
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 	tt.second = 0;
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 	tt.is_date = 1;
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-	tt.is_utc = 1;
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 	tt.is_daylight = 0;
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-	tt.zone = NULL;
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+	tt.zone = icaltimezone_get_utc_timezone ();
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 	return tt;
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 }
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@@ -390,10 +383,9 @@ struct icaltimetype get_icaldate_from_Gl
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 	tt.minute = 0;
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 	tt.second = 0;
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-	tt.is_utc      = 1;
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 	tt.is_date     = 1;
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 	tt.is_daylight = 0;
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-	tt.zone        = NULL;
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+	tt.zone        = icaltimezone_get_utc_timezone ();
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 	return tt;
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 }