diff --git a/RFXtoRP_HsrCarrierApt_CarrierExpected.ftl b/RFXtoRP_HsrCarrierApt_CarrierExpected.ftl
index b5df356..4efcc3e 100644
--- a/RFXtoRP_HsrCarrierApt_CarrierExpected.ftl
+++ b/RFXtoRP_HsrCarrierApt_CarrierExpected.ftl
@@ -1,5 +1,5 @@
 [
-    <#assign ref_datetime = RfxDateTimetoUTCWithTimezone(carrier_apt.metadata.creation_datetime,time_zone_rfx) />
+    <#assign ref_datetime = RfxDateTimetoUTCWithTimezone(carrier_apt.metadata.last_update_datetime,time_zone_rfx) />
     <#assign ref_datetime2 = AddSecondsToDatetime(ref_datetime?datetime.iso, 60)?iso_utc />
     {
         "Header": {