diff --git a/udpechoserver/src/datamodel.c b/udpechoserver/src/datamodel.c
index 5f5e01cf6..038b24fcc 100644
--- a/udpechoserver/src/datamodel.c
+++ b/udpechoserver/src/datamodel.c
@@ -177,13 +177,13 @@ static int get_IPDiagnosticsUDPEchoConfig_BytesResponded(char *refparam, struct
 
 static int get_IPDiagnosticsUDPEchoConfig_TimeFirstPacketReceived(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
 {
-	*value = udpechoconfig_get("TimeFirstPacketReceived", "0");
+	*value = udpechoconfig_get("TimeFirstPacketReceived", "0001-01-01T00:00:00.000000Z");
 	return 0;
 }
 
 static int get_IPDiagnosticsUDPEchoConfig_TimeLastPacketReceived(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
 {
-	*value = udpechoconfig_get("TimeLastPacketReceived", "0");
+	*value = udpechoconfig_get("TimeLastPacketReceived", "0001-01-01T00:00:00.000000Z");
 	return 0;
 }