diff --git a/linphone-app/src/components/conferenceInfo/ConferenceInfoModel.cpp b/linphone-app/src/components/conferenceInfo/ConferenceInfoModel.cpp
index 583e8a855..c99a2bc24 100644
--- a/linphone-app/src/components/conferenceInfo/ConferenceInfoModel.cpp
+++ b/linphone-app/src/components/conferenceInfo/ConferenceInfoModel.cpp
@@ -139,7 +139,7 @@ std::shared_ptr<linphone::ConferenceInfo> ConferenceInfoModel::findConferenceInf
 
 //------------------------------------------------------------------------------------------------
 
-
+//Note conferenceInfo->getDateTime uses system timezone.
 QDateTime ConferenceInfoModel::getDateTimeUtc() const{
 	return QDateTime::fromMSecsSinceEpoch(mConferenceInfo->getDateTime() * 1000).toUTC();
 }
diff --git a/linphone-app/ui/modules/Linphone/Chat/ChatCalendarMessage.qml b/linphone-app/ui/modules/Linphone/Chat/ChatCalendarMessage.qml
index 4f8be65ec..febc5c715 100644
--- a/linphone-app/ui/modules/Linphone/Chat/ChatCalendarMessage.qml
+++ b/linphone-app/ui/modules/Linphone/Chat/ChatCalendarMessage.qml
@@ -111,7 +111,8 @@ Loader{
 						color: ChatCalendarMessageStyle.schedule.color
 						elide: Text.ElideRight
 						font.pointSize: ChatCalendarMessageStyle.schedule.pointSize
-						text: Qt.formatDateTime(mainItem.conferenceInfoModel.dateTime, 'hh:mm')
+// Reminder: QML use locale time (not system). Use UTC from C++ => convert it into QML => pass QML => convert it into UTC and apply our timezone.
+						text: UtilsCpp.toTimeString(Utils.fromUTC(mainItem.conferenceInfoModel.dateTimeUtc), 'hh:mm')
 								+ (mainItem.conferenceInfoModel.duration > 0 ? ' (' +Utils.formatDuration(mainItem.conferenceInfoModel.duration * 60) + ')'
 																			: '')																			
 					}
diff --git a/linphone-app/ui/modules/Linphone/Chat/ChatConferenceInvitationMessage.qml b/linphone-app/ui/modules/Linphone/Chat/ChatConferenceInvitationMessage.qml
index e9820c144..d0b487a3d 100644
--- a/linphone-app/ui/modules/Linphone/Chat/ChatConferenceInvitationMessage.qml
+++ b/linphone-app/ui/modules/Linphone/Chat/ChatConferenceInvitationMessage.qml
@@ -158,7 +158,7 @@ Loader{
 						color: ChatCalendarMessageStyle.schedule.color
 						elide: Text.ElideRight
 						font.pointSize: Units.dp * 8
-						text: Qt.formatDate(mainItem.conferenceInfoModel.dateTimeUtc, 'yyyy/MM/dd')
+						text: UtilsCpp.toDateString(Utils.fromUTC(mainItem.conferenceInfoModel.dateTimeUtc), 'yyyy/MM/dd')
 					}
 				}
 				RowLayout {
@@ -182,7 +182,8 @@ Loader{
 						color: ChatCalendarMessageStyle.schedule.color
 						elide: Text.ElideRight
 						font.pointSize: Units.dp * 8
-						text: Qt.formatDateTime(mainItem.conferenceInfoModel.dateTimeUtc, 'hh:mm')
+// Reminder: QML use locale time (not system). Use UTC from C++ => convert it into QML => pass QML => convert it into UTC and apply our timezone.
+						text: UtilsCpp.toTimeString( Utils.fromUTC(mainItem.conferenceInfoModel.dateTimeUtc), 'hh:mm')
 							  + (mainItem.conferenceInfoModel.duration > 0 ? ' ('+Utils.formatDuration(mainItem.conferenceInfoModel.duration * 60) + ')'
 																		   : '')
 					}
diff --git a/linphone-app/ui/scripts/Utils/utils.js b/linphone-app/ui/scripts/Utils/utils.js
index dc4e2f202..d82ed2452 100644
--- a/linphone-app/ui/scripts/Utils/utils.js
+++ b/linphone-app/ui/scripts/Utils/utils.js
@@ -562,6 +562,14 @@ function buildDate(date, time){
 	dateTime.setSeconds(time.getSeconds())
 	return dateTime
 }
+
+
+function fromUTC(date){
+	return new Date(Date.UTC(date.getUTCFullYear(), date.getUTCMonth(),
+                date.getUTCDate(), date.getUTCHours(),
+                date.getUTCMinutes(), date.getUTCSeconds()));
+}
+
 // -----------------------------------------------------------------------------
 
 function formatSize (size) {